KPA-1500 Fan Noise - YouTube ?
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KPA-1500 Fan Noise - YouTube ?
 
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This fan noise issue has me concerned to the point that I’m considering cancelling my order.
While the amp won’t be on my operating desk, it will be on a rack next to my operating desk. Remoting the amp is not an option. Quite frankly I have no interest in remoting the amp. Is there anyone out there that has a KPA-1500 willing to post a YouTube video so we can hear the fan in action and judge the noise for ourselves? From the research I’ve done it appears that if you want a solid state amp, regardless of make, you need to be prepared for fan noise. Thanks Rich - N5ZC Sent from my iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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Rich
You pretty much hit the nail on the head about solid state amps. As they say there's no free lunch. Solid state has made great strides in high power ampsbut its still solid state and a p/n junction or some form thereof. 1500 watts of heat in those junctions has to be cooled down or it won't be long before it needsnew parts. Depending on your operating habits (contesting, casual, or whatever) there will be varying degrees of fan noise. The higher the duty cycle the higher thefan requirements. Pick your poison, a small light weight amp easy to move around or one you need a fork lift to pick up. I prefer tube amps for a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the living room temporarily) but I'm still glad I got the kpa1500 at least so far. The kpa sits nicely on top of the Acom without causing the table they sit on to crash to the floor in pieces, hi. I'm surprised nobody has made a you tube ofthe amp in operation actually. But there are only just over 200 of the new amps out there. Good luck with your investigation, Rich. BillK3WJV On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne <[hidden email]> wrote: This fan noise issue has me concerned to the point that I’m considering cancelling my order. While the amp won’t be on my operating desk, it will be on a rack next to my operating desk. Remoting the amp is not an option. Quite frankly I have no interest in remoting the amp. Is there anyone out there that has a KPA-1500 willing to post a YouTube video so we can hear the fan in action and judge the noise for ourselves? From the research I’ve done it appears that if you want a solid state amp, regardless of make, you need to be prepared for fan noise. Thanks Rich - N5ZC Sent from my iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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Bill is correct
You have to move air to cool down those devices and it takes fans to do it. Water cooling might work if you wish to modify it. :) But, there is no free lunch as was mentioned. Be prepared that any 1500 watt LMDOS amp requires cooling but since there is no tube, they are built in smaller boxes, so you get smaller fans that have to move more air. The B26 is somewhat quieter I think, but they worked on some things to make it quieter like extending the fan out the back so there is less disturbed air when it hits the fan blades. They aren't that loud and if were good headphones, you won't notice at all. my 2 cents, Mike va3mw On Fri, Jun 1, 2018 at 8:32 PM, Bill Stravinsky via Elecraft < [hidden email]> wrote: > Rich > > You pretty much hit the nail on the head about solid state amps. As they > say there's no free lunch. Solid state has made great strides in high > power ampsbut its still solid state and a p/n junction or some form > thereof. 1500 watts of heat in those junctions has to be cooled down or it > won't be long before it needsnew parts. > Depending on your operating habits (contesting, casual, or whatever) there > will be varying degrees of fan noise. The higher the duty cycle the higher > thefan requirements. Pick your poison, a small light weight amp easy to > move around or one you need a fork lift to pick up. I prefer tube amps for > a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the > living room temporarily) but I'm still glad I got the kpa1500 at least so > far. > The kpa sits nicely on top of the Acom without causing the table they sit > on to crash to the floor in pieces, hi. I'm surprised nobody has made a > you tube ofthe amp in operation actually. But there are only just over 200 > of the new amps out there. Good luck with your investigation, Rich. > BillK3WJV > > On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne < > [hidden email]> wrote: > > This fan noise issue has me concerned to the point that I’m considering > cancelling my order. > > While the amp won’t be on my operating desk, it will be on a rack next to > my operating desk. Remoting the amp is not an option. Quite frankly I have > no interest in remoting the amp. > > Is there anyone out there that has a KPA-1500 willing to post a YouTube > video so we can hear the fan in action and judge the noise for ourselves? > > From the research I’ve done it appears that if you want a solid state amp, > regardless of make, you need to be prepared for fan noise. > > Thanks > > Rich - N5ZC > > Sent from my iPhone > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Elecraft mailing list
So just a bit of thermodynamics... if the input to any amplifier is 1500 watts and it is 50% efficient, since energy is conserved, 750 watts will come out in another form.. and in this case it's heat. Doesn't matter what the converter is (transistor, tube, resistor, etc.). It all behaves the same. Need to get rid of 750 watts of heat. The only difference may be the way the heat is taken away of the converter... convection (heat sink), forced convection (heat skin plus fan), liquid convection (water cooled heat sink). The poison is the heat removal device not the converter.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Like us on Facebook! Moderator – North American QRO Group at Groups.IO. email: [hidden email] -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bill Stravinsky via Elecraft Sent: Friday, June 1, 2018 7:33 PM To: Elecraft Reflector <[hidden email]> Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? Rich You pretty much hit the nail on the head about solid state amps. As they say there's no free lunch. Solid state has made great strides in high power ampsbut its still solid state and a p/n junction or some form thereof. 1500 watts of heat in those junctions has to be cooled down or it won't be long before it needsnew parts. Depending on your operating habits (contesting, casual, or whatever) there will be varying degrees of fan noise. The higher the duty cycle the higher thefan requirements. Pick your poison, a small light weight amp easy to move around or one you need a fork lift to pick up. I prefer tube amps for a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the living room temporarily) but I'm still glad I got the kpa1500 at least so far. The kpa sits nicely on top of the Acom without causing the table they sit on to crash to the floor in pieces, hi. I'm surprised nobody has made a you tube ofthe amp in operation actually. But there are only just over 200 of the new amps out there. Good luck with your investigation, Rich. BillK3WJV On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne <[hidden email]> wrote: This fan noise issue has me concerned to the point that I’m considering cancelling my order. While the amp won’t be on my operating desk, it will be on a rack next to my operating desk. Remoting the amp is not an option. Quite frankly I have no interest in remoting the amp. Is there anyone out there that has a KPA-1500 willing to post a YouTube video so we can hear the fan in action and judge the noise for ourselves? From the research I’ve done it appears that if you want a solid state amp, regardless of make, you need to be prepared for fan noise. Thanks Rich - N5ZC Sent from my iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] --- This email has been checked for viruses by AVG. https://www.avg.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Michael Walker
Some years ago we cooled a PDP11 by putting the fan remote and running a dryer hose to the computer. How about putting the fan in the basement and the rig on the desk where it’s handy?
Chuck Jack KE9UW Sent from my iPhone, cjack > On Jun 1, 2018, at 7:57 PM, Michael Walker <[hidden email]> wrote: > > Bill is correct > > You have to move air to cool down those devices and it takes fans to do > it. Water cooling might work if you wish to modify it. :) > > But, there is no free lunch as was mentioned. Be prepared that any 1500 > watt LMDOS amp requires cooling but since there is no tube, they are built > in smaller boxes, so you get smaller fans that have to move more air. > > The B26 is somewhat quieter I think, but they worked on some things to make > it quieter like extending the fan out the back so there is less disturbed > air when it hits the fan blades. > > They aren't that loud and if were good headphones, you won't notice at all. > > my 2 cents, Mike va3mw > > > On Fri, Jun 1, 2018 at 8:32 PM, Bill Stravinsky via Elecraft < > [hidden email]> wrote: > >> Rich >> >> You pretty much hit the nail on the head about solid state amps. As they >> say there's no free lunch. Solid state has made great strides in high >> power ampsbut its still solid state and a p/n junction or some form >> thereof. 1500 watts of heat in those junctions has to be cooled down or it >> won't be long before it needsnew parts. >> Depending on your operating habits (contesting, casual, or whatever) there >> will be varying degrees of fan noise. The higher the duty cycle the higher >> thefan requirements. Pick your poison, a small light weight amp easy to >> move around or one you need a fork lift to pick up. I prefer tube amps for >> a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the >> living room temporarily) but I'm still glad I got the kpa1500 at least so >> far. >> The kpa sits nicely on top of the Acom without causing the table they sit >> on to crash to the floor in pieces, hi. I'm surprised nobody has made a >> you tube ofthe amp in operation actually. But there are only just over 200 >> of the new amps out there. Good luck with your investigation, Rich. >> BillK3WJV >> >> On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne < >> [hidden email]> wrote: >> >> This fan noise issue has me concerned to the point that I’m considering >> cancelling my order. >> >> While the amp won’t be on my operating desk, it will be on a rack next to >> my operating desk. Remoting the amp is not an option. Quite frankly I have >> no interest in remoting the amp. >> >> Is there anyone out there that has a KPA-1500 willing to post a YouTube >> video so we can hear the fan in action and judge the noise for ourselves? >> >> From the research I’ve done it appears that if you want a solid state amp, >> regardless of make, you need to be prepared for fan noise. >> >> Thanks >> >> Rich - N5ZC >> >> Sent from my iPhone >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Chuck, KE9UW
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Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Dr. William J. Schmidt, II
Tube amp just has the single fan that doesn't spin at 9000 rpm like the little solid state fans, hi. Same noise level if xmit or not.
BillK3WJV On Friday, June 1, 2018, 9:04:45 PM EDT, Dr. William J. Schmidt <[hidden email]> wrote: So just a bit of thermodynamics... if the input to any amplifier is 1500 watts and it is 50% efficient, since energy is conserved, 750 watts will come out in another form.. and in this case it's heat. Doesn't matter what the converter is (transistor, tube, resistor, etc.). It all behaves the same. Need to get rid of 750 watts of heat. The only difference may be the way the heat is taken away of the converter... convection (heat sink), forced convection (heat skin plus fan), liquid convection (water cooled heat sink). The poison is the heat removal device not the converter. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Like us on Facebook! Moderator – North American QRO Group at Groups.IO. email: [hidden email] -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bill Stravinsky via Elecraft Sent: Friday, June 1, 2018 7:33 PM To: Elecraft Reflector <[hidden email]> Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? Rich You pretty much hit the nail on the head about solid state amps. As they say there's no free lunch. Solid state has made great strides in high power ampsbut its still solid state and a p/n junction or some form thereof. 1500 watts of heat in those junctions has to be cooled down or it won't be long before it needsnew parts. Depending on your operating habits (contesting, casual, or whatever) there will be varying degrees of fan noise. The higher the duty cycle the higher thefan requirements. Pick your poison, a small light weight amp easy to move around or one you need a fork lift to pick up. I prefer tube amps for a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the living room temporarily) but I'm still glad I got the kpa1500 at least so far. The kpa sits nicely on top of the Acom without causing the table they sit on to crash to the floor in pieces, hi. I'm surprised nobody has made a you tube ofthe amp in operation actually. But there are only just over 200 of the new amps out there. Good luck with your investigation, Rich. BillK3WJV On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne <[hidden email]> wrote: This fan noise issue has me concerned to the point that I’m considering cancelling my order. While the amp won’t be on my operating desk, it will be on a rack next to my operating desk. Remoting the amp is not an option. Quite frankly I have no interest in remoting the amp. Is there anyone out there that has a KPA-1500 willing to post a YouTube video so we can hear the fan in action and judge the noise for ourselves? From the research I’ve done it appears that if you want a solid state amp, regardless of make, you need to be prepared for fan noise. Thanks Rich - N5ZC Sent from my iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] --- This email has been checked for viruses by AVG. https://www.avg.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by ke9uw
What's a basement? On towertalk they talk about letting the lawn grow over
ground radials. I wonder what a lawn is. They also say to install ground rods where the rain will hit them. I wonder what rain is. Wes N7WS On 6/1/2018 6:05 PM, hawley, charles j jr wrote: > Some years ago we cooled a PDP11 by putting the fan remote and running a dryer hose to the computer. How about putting the fan in the basement and the rig on the desk where it’s handy? > > Chuck Jack > KE9UW ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Richard Thorne-4
I personally think all the banter about KPA1500 fan noise has created confusion. Yes, the amp has three fans with five selectable fan speeds..and since the amp is small the fans are necessarily small and therefore must run faster …. and as the fan speed increases the pitch and noise levels increase.. and the higher fan speeds do indeed create significant noise, but the higher speeds will rarely (if ever) be needed. I have had my KPA1500 about 3 months now, and have manually switched to level 3 just a couple times (cq running during cw contest and major cw split pileup), and thus far I have never had to use levels 4 or 5. The fans operate automatically as per heat sink temperature but can also be manually controlled. Fan speeds 1 and 2, to me, are just like any other amplifier, and noise is not problematic. Levels 3, 4, and 5 however are definitely noisy and can become annoying…. But again, those speeds are rarely necessary. IMHO, with five selectable speeds, the KPA1500 could very likely have the most capable cooling system available in any amateur amplifier.... and I call that a plus. The three additional amplifiers in my shack (Alpha 9500, Icom PA1 and Alpha 89) make noise too, but it’s probably a good bet that they do not have cooling capability that matches the KPA1500’s five speed fans.
Don, N5LZ -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Richard Thorne Sent: Friday, June 01, 2018 5:55 PM To: [hidden email] Subject: [Elecraft] KPA-1500 Fan Noise - YouTube ? This fan noise issue has me concerned to the point that I’m considering cancelling my order. While the amp won’t be on my operating desk, it will be on a rack next to my operating desk. Remoting the amp is not an option. Quite frankly I have no interest in remoting the amp. Is there anyone out there that has a KPA-1500 willing to post a YouTube video so we can hear the fan in action and judge the noise for ourselves? From the research I’ve done it appears that if you want a solid state amp, regardless of make, you need to be prepared for fan noise. Thanks Rich - N5ZC Sent from my iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Dr. William J. Schmidt, II
Only one bit of correction. If the output power is 1500 watts and the
efficiency is 50%, that 1500 watts is only half the total power consumed, so there is 1500 watts of power that must be exhausted as heat. Yes, it is all thermodynamics, that heat must be dissipated somehow. Fans are the obvious solution. 73, Don W3FPR On 6/1/2018 8:59 PM, Dr. William J. Schmidt wrote: > So just a bit of thermodynamics... if the input to any amplifier is 1500 watts and it is 50% efficient, since energy is conserved, 750 watts will come out in another form.. and in this case it's heat. Doesn't matter what the converter is (transistor, tube, resistor, etc.). It all behaves the same. Need to get rid of 750 watts of heat. The only difference may be the way the heat is taken away of the converter... convection (heat sink), forced convection (heat skin plus fan), liquid convection (water cooled heat sink). The poison is the heat removal device not the converter. > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ > > Owner - Operator > Big Signal Ranch – K9ZC > Staunton, Illinois > > Owner – Operator > Villa Grand Piton – J68HZ > Soufriere, St. Lucia W.I. > Rent it: www.VillaGrandPiton.com > Like us on Facebook! > > Moderator – North American QRO Group at Groups.IO. > > email: [hidden email] > > > > -----Original Message----- > From: [hidden email] [mailto:[hidden email]] On Behalf Of Bill Stravinsky via Elecraft > Sent: Friday, June 1, 2018 7:33 PM > To: Elecraft Reflector <[hidden email]> > Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? > > Rich > > You pretty much hit the nail on the head about solid state amps. As they say there's no free lunch. Solid state has made great strides in high power ampsbut its still solid state and a p/n junction or some form thereof. 1500 watts of heat in those junctions has to be cooled down or it won't be long before it needsnew parts. > Depending on your operating habits (contesting, casual, or whatever) there will be varying degrees of fan noise. The higher the duty cycle the higher thefan requirements. Pick your poison, a small light weight amp easy to move around or one you need a fork lift to pick up. I prefer tube amps for a few reasonsand have the Acom 2000a (and an Alpha 89 that now sits in the living room temporarily) but I'm still glad I got the kpa1500 at least so far. > The kpa sits nicely on top of the Acom without causing the table they sit on to crash to the floor in pieces, hi. I'm surprised nobody has made a you tube ofthe amp in operation actually. But there are only just over 200 of the new amps out there. Good luck with your investigation, Rich. > BillK3WJV > > On Friday, June 1, 2018, 8:00:29 PM EDT, Richard Thorne <[hidden email]> wrote: > > This fan noise issue has me concerned to the point that I’m considering cancelling my order. > > While the amp won’t be on my operating desk, it will be on a rack next to my operating desk. Remoting the amp is not an option. Quite frankly I have no interest in remoting the amp. > > Is there anyone out there that has a KPA-1500 willing to post a YouTube video so we can hear the fan in action and judge the noise for ourselves? > > From the research I’ve done it appears that if you want a solid state amp, regardless of make, you need to be prepared for fan noise. > > Thanks > > Rich - N5ZC > > Sent from my iPhone > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] > > > --- > This email has been checked for viruses by AVG. > https://www.avg.com > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Wes Stewart-2
Wes, tnx for the chuckle.
No lawn mower, no umbrella, no place to store unwanted and unnecessary junk. You are livin' a dream. And you can string your dipoles from the Saguaro. Hey, if the arms are the correct lengths you can string some verticals to cover multiple bands. And if the arms are the same length maybe you can make a phased array? I don't miss being entertained by the rattlers and Javelinas on the golf course in Tucson. 73, N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Wes Stewart Sent: Friday, June 01, 2018 9:28 PM To: [hidden email] Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? What's a basement? On towertalk they talk about letting the lawn grow over ground radials. I wonder what a lawn is. They also say to install ground rods where the rain will hit them. I wonder what rain is. Wes N7WS On 6/1/2018 6:05 PM, hawley, charles j jr wrote: > Some years ago we cooled a PDP11 by putting the fan remote and running a dryer hose to the computer. How about putting the fan in the basement and the rig on the desk where it’s handy? > > Chuck Jack > KE9UW ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Don Wilhelm
One other thought to keep in mind - solid state amps need a lower delta T
than tube amps. Tubes like to run hot - solid state devices not so much. I've seen a tube with the fins so hot that the solder was in globs, while the transmitter was still operating. I doubt any solid state final would have survived that heat. When we installed our solid state TV transmitter, it was a new learning curve in cooling. Both transmitters were 30 kW class AB1. The tube transmitter moved air faster through 3 tubes but had almost 3 times the temperature rise than the specs for the solid state transmitter. Our HVAC company and architect worked on several complex systems with air mixers until we just decided to use wall mounted air conditioners into the room behind the transmitter racks and exhausted to the front of the transmitters. Our solid state transmitter did meet the OSHA limit for 8 hours exposure to noise but just barely. It was very noisy compared to the tube unit. No tube transmitter I have ever used had a temperature shut down on any of the tube stages. 73 George AI4VZ -----Original Message----- From: Don Wilhelm Only one bit of correction. If the output power is 1500 watts and the efficiency is 50%, that 1500 watts is only half the total power consumed, so there is 1500 watts of power that must be exhausted as heat. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Richard Thorne-4
While running stations on 160m at a high rate, the finals of an Omni VI got so hot that output dropped to zero. Once the finals cooled for maybe about five minutes, full output returned. We then put a small fan on the heat sink fins and experienced no further problem. No damage at all to the components. Unfortunately, the same Omni VI was hit by lightning some years later.
73, Will, wj9b CWops #1085 CWA Advisor levels II and III http://cwops.org/ -------------------------------------------- On Sat, 6/2/18, Gmail - George <[hidden email]> wrote: Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? To: [hidden email] Date: Saturday, June 2, 2018, 6:10 AM One other thought to keep in mind - solid state amps need a lower delta T than tube amps. Tubes like to run hot - solid state devices not so much. I've seen a tube with the fins so hot that the solder was in globs, while the transmitter was still operating. I doubt any solid state final would have survived that heat. When we installed our solid state TV transmitter, it was a new learning curve in cooling. Both transmitters were 30 kW class AB1. The tube transmitter moved air faster through 3 tubes but had almost 3 times the temperature rise than the specs for the solid state transmitter. Our HVAC company and architect worked on several complex systems with air mixers until we just decided to use wall mounted air conditioners into the room behind the transmitter racks and exhausted to the front of the transmitters. Our solid state transmitter did meet the OSHA limit for 8 hours exposure to noise but just barely. It was very noisy compared to the tube unit. No tube transmitter I have ever used had a temperature shut down on any of the tube stages. 73 George AI4VZ -----Original Message----- From: Don Wilhelm Only one bit of correction. If the output power is 1500 watts and the efficiency is 50%, that 1500 watts is only half the total power consumed, so there is 1500 watts of power that must be exhausted as heat. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: KPA-1500 Fan Noise - YouTube ?
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In reply to this post by Richard Thorne-4
Ah, yes ... the desert. Land of rattlesnakes, hairy spiders, and
horny toads. We got none of them in Alaska, absolutely no snakes of any flavor, only garden spiders, and only the goldminers are h***. Enough rain to never water the lawn. We got snow, too!! I lived on the edge of the Mojave in Barstow, CA so know the desert. Tuscon is a nice town; visited in 1997. 73, Ed - KL7UW From: Wes Stewart <[hidden email]> To: [hidden email] Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? What's a basement?? On towertalk they talk about letting the lawn grow over ground radials.? I wonder what a lawn is.? They also say to install ground rods where the rain will hit them.? I wonder what rain is. Wes? N7WS 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by George Danner-2
George, there is nothing like Eimac Orange with a glass bottle. RF sunburn
:-) Hey, transistors can run pretty hot too, although they should not melt the solder. Case temp can get to 150 deg C and junction temp to 225 deg C. Yes your finger will burn on the case. And yes, the life of many power devices gets derated based on junction temp. As an example an LDMOS may have an MTTF of 1M hours at 150C and 70K hours at 225C junction temp. JANS space transistors are burned in at 220C and tested up to 125C case temp. N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Gmail - George Sent: Saturday, June 02, 2018 8:10 AM To: [hidden email] Subject: Re: [Elecraft] KPA-1500 Fan Noise - YouTube ? One other thought to keep in mind - solid state amps need a lower delta T than tube amps. Tubes like to run hot - solid state devices not so much. I've seen a tube with the fins so hot that the solder was in globs, while the transmitter was still operating. I doubt any solid state final would have survived that heat. When we installed our solid state TV transmitter, it was a new learning curve in cooling. Both transmitters were 30 kW class AB1. The tube transmitter moved air faster through 3 tubes but had almost 3 times the temperature rise than the specs for the solid state transmitter. Our HVAC company and architect worked on several complex systems with air mixers until we just decided to use wall mounted air conditioners into the room behind the transmitter racks and exhausted to the front of the transmitters. Our solid state transmitter did meet the OSHA limit for 8 hours exposure to noise but just barely. It was very noisy compared to the tube unit. No tube transmitter I have ever used had a temperature shut down on any of the tube stages. 73 George AI4VZ -----Original Message----- From: Don Wilhelm Only one bit of correction. If the output power is 1500 watts and the efficiency is 50%, that 1500 watts is only half the total power consumed, so there is 1500 watts of power that must be exhausted as heat. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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