OT Amptec LA2000 Linear Amp
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Re: OT Amptec LA2000 Linear Amp
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You know it is only 1 S unit more... 6db.
It is the first 500 watts that count. Mike va3mw On Fri, May 27, 2016 at 8:05 PM, Mike Rhodes <[hidden email]> wrote: > > ______________________________________________________________ > 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: OT Amptec LA2000 Linear Amp
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In reply to this post by Mike Rhodes
I have a KPA500, and an Alpha 8410. The 8410, running a pair of 4cx1000A
tetrodes in conventional AB1, can deal with rather high SWR directly without grid current that can destroy a tube. However, if any of the complex supporting monitoring circuitry or protection circuity goes blewwy, one needs the nearby manufacturer who will actually have the parts to fix it. Elecraft is all there for you and easy to get to. With higher freight charges for all the extra weight and size, so is Alpha. The crucial element is whether it can be serviced in the US by someone who will have the parts and can honor a warranty. For me it was a good thing that the Alpha boys were around because mine suffered a very weird blowup in the screen circuitry that took a lot of stuff with it. Alpha fixed it, and it's back on line. Who's the servicing in the US for Amptec and what kind of a reputation do they have? Funny you would come on the Elecraft reflector to ask about Amptec. Time to go Google and chase leads. Then there's the other thing, that you only need the extra S unit for QSO's that are at the edge of serviceable propagation. I had a friend that sold his Acom 2000 after he had his KPA500 for a while. Breaking a pileup is way more between the ears than between the conductors on the power cord. Good luck in any event. 73, Guy K2AV On Fri, May 27, 2016 at 8:05 PM, Mike Rhodes <[hidden email]> wrote: > > ______________________________________________________________ > 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 Michael Walker
If you are QRP oriented, then the first 5 watts counts. To get a 1 dB
increase (6 dB), one needs to quadruple the power - 20 watts. 73, Don W3FPR On 5/27/2016 8:13 PM, Michael Walker wrote: > You know it is only 1 S unit more... 6db. > > It is the first 500 watts that count. > > ______________________________________________________________ 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 Mike Rhodes
______________________________________________________________ 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
My mistake - 1 S-unit increase is 6 dB, not 1 dB.
73, Don W3FPR If you are QRP oriented, then the first 5 watts counts. To get a 1 dB increase (6 dB), one needs to quadruple the power - 20 watts. 73, Don W3FPR ______________________________________________________________ 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 Mike Rhodes
...did I get it yet?
On 5/27/2016 8:38 PM, Mike Rhodes wrote: > ...sorry about the resend but hopefully it will arrive with content > this time. > > On 5/27/2016 8:05 PM, Mike Rhodes wrote: >> ...a trip back for service or updates is going to cost a fortune!! >> >> Mike / W8DN >> >> On 5/27/2016 7:25 PM, David Ahrendts wrote: >>> I am 100% totally, absolutely in love with my KPA500 linear amp. It is incredible. Fail safe. Loyal. Attractive. Beautiful. —— There are times, however, that I dream of a little more horse power. Would any of you trust the Amptec LA2000: >>> >>> http://www.ebay.com/itm/AMPTEC-LA2000-2000W-HF-tube-linear-amplifier/272234339459?_trksid=p2060778.c100276.m3476&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140725133649%26meid%3Da46bc7a1c1274120a571252811a8f6bb%26pid%3D100276%26rk%3D1%26rkt%3D4%26sd%3D121996613826 <http://www.ebay.com/itm/AMPTEC-LA2000-2000W-HF-tube-linear-amplifier/272234339459?_trksid=p2060778.c100276.m3476&_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20140725133649&meid=a46bc7a1c1274120a571252811a8f6bb&pid=100276&rk=1&rkt=4&sd=121996613826> >>> >>> David Ahrendts, KK6DA, Los Angeles >>> >>> >>> >>> >>> David [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 [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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Mike,
I suspect you posted with HTML enabled - the reflector strips HTML and results in a blank post. Normal service for the KPA500 requests that you remove the transformer. That not only reduces weight (and shipping cost) but also reduces the probability of damage to the KPA500 enclosure if the shipping package encounters a downward impact which could cause the weight of the transformer to deform the KPA500 bottom panel. 73, Don W3FPR On 5/27/2016 8:41 PM, Mike Rhodes wrote: > ...did I get it yet? > > On 5/27/2016 8:38 PM, Mike Rhodes wrote: >> ...sorry about the resend but hopefully it will arrive with content >> this time. >> >> On 5/27/2016 8:05 PM, Mike Rhodes wrote: >>> ...a trip back for service or updates is going to cost a fortune!! >>> ______________________________________________________________ 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 David Ahrendts
To echo the advice of others, unless you're a skilled tech or know someone close by, I wouldn't touch this amp. The "name brand" amps sold in the US through distributors are well engineered and supported by organizations that will honor warranties and deal with problems. The amp you linked doesn't even have a manual in English (instead referring you to "other amps" manuals). If you need service under or post warranty, you may be on your own, or hit with a big shipping bill. The listing also doesn't say it's been registered with the FCC or meets US spectral purity and gain regs. If there's one place in your station to get a solid piece of equipment and not "cheap out", it's the high power amp. High power needs well designed circuits and robust components to function at its highest potential. It also needs well designed and built safety lockouts - with the high voltage involved you can die if you get inside for any reason (not just installing the transformer). If you don't want to pay the price of a new amp, look at the used market. There are lots of well designed and robust tube amps of recent vintage worth looking at that won't break your bank account. There are also a number of techs around that can work on these amps if not under warranty. Solid amps made by Alpha, command, Acom, and QRO come to mind. Some solid state amps might be ok but full legal limit ones are fewer in number and higher in cost. 73, Lou, W0FK
St. Louis, MO
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