new owner looking for fuses.

[John Clemmer]

Hello.  new owner of a KPA 500 and KAT 500.  Previous owner is a good friend of mine.  He had 220 in his shack. He had 6 amp fuses in it.    I have 110 and am looking hard for fuses for the KPA 500.  Manual says two 12 amp fuses for 115V.  tech said use slow blow ones.  Any suggestions.  Can't seem to find a forum for Elelecraft.  Will 12 amp 230 v work????  

John
KB4OIF
Proud Vietnam Vet
Freedom is not free, someone paid!!!
There would be no freedom without the military........
In GOD, we trust.
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[Don Wilhelm]

John yes, 12 amp 240 volts will work fine.  The voltage rating for a
fuse is "any voltage up to the rated voltage".

The manual statement to use "12A fuses for 115V" does NOT mean that the
fuses must be rated for 115V.

73,
Don W3FPR


On 7/14/2018 1:43 PM, John Clemmer wrote:
> Hello.  new owner of a KPA 500 and KAT 500.  Previous owner is a good friend of mine.  He had 220 in his shack. He had 6 amp fuses in it.    I have 110 and am looking hard for fuses for the KPA 500.  Manual says two 12 amp fuses for 115V.  tech said use slow blow ones.  Any suggestions.  Can't seem to find a forum for Elelecraft.  Will 12 amp 230 v work????
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[markmusick]

John,
The Elecraft part numbers you are looking for are:
E850449 Fuse Set 6A, 2pcs for 240 Volt operation
E850448 Fuse Set 12A, 2pcs for 120 Volt operation
I operate my KPA500 on 240 Volts, but on FD operate it on 120 Volts.
I ordered 2 sets of each for spares and the capability to operate on either
Voltage.

Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On
Behalf Of John Clemmer
Sent: Saturday, July 14, 2018 5:44 PM
To: [hidden email]
Subject: [Elecraft] new owner looking for fuses.

Hello.  new owner of a KPA 500 and KAT 500.  Previous owner is a good friend
of mine.  He had 220 in his shack. He had 6 amp fuses in it.    I have 110
and am looking hard for fuses for the KPA 500.  Manual says two 12 amp fuses
for 115V.  tech said use slow blow ones.  Any suggestions.  Can't seem to
find a forum for Elelecraft.  Will 12 amp 230 v work????  

John
KB4OIF
Proud Vietnam Vet
Freedom is not free, someone paid!!!
There would be no freedom without the military........
In GOD, we trust.
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[markmusick]

John,
Just send an e-mail to Elecraft sales.
Give them the Elecraft part numbers I sent you and the quantity you want. Tell them you need instructions on how to purchase them through the website.
They will reply to you with their current price and how to order them through the Elecraft website.
It has been so long I have forgotten how I ordered them through the website. I'd have to ask them again myself, if I needed replacements.

Mark, WB9CIF

-----Original Message-----
From: John Clemmer <[hidden email]>
Sent: Saturday, July 14, 2018 11:22 PM
To: Mark E. Musick <[hidden email]>
Subject: RE: [Elecraft] new owner looking for fuses.

Hi Mark been all over their page Elecraft and see no way to order parts.  

John KB4OIF

> On July 14, 2018 at 5:59 PM "Mark E. Musick" <[hidden email]> wrote:
>
>
> John,
> The Elecraft part numbers you are looking for are:
> E850449 Fuse Set 6A, 2pcs for 240 Volt operation
> E850448 Fuse Set 12A, 2pcs for 120 Volt operation I operate my KPA500
> on 240 Volts, but on FD operate it on 120 Volts.
> I ordered 2 sets of each for spares and the capability to operate on
> either Voltage.
>
> Mark, WB9CIF
>
> -----Original Message-----
> From: [hidden email]
> <[hidden email]> On Behalf Of John Clemmer
> Sent: Saturday, July 14, 2018 5:44 PM
> To: [hidden email]
> Subject: [Elecraft] new owner looking for fuses.
>
> Hello.  new owner of a KPA 500 and KAT 500.  Previous owner is a good friend
> of mine.  He had 220 in his shack. He had 6 amp fuses in it.    I have 110
> and am looking hard for fuses for the KPA 500.  Manual says two 12 amp
> fuses for 115V.  tech said use slow blow ones.  Any suggestions.  
> Can't seem to find a forum for Elelecraft.  Will 12 amp 230 v work????
>
> John
> KB4OIF
> Proud Vietnam Vet
> Freedom is not free, someone paid!!!
> There would be no freedom without the military........
> In GOD, we trust.
> ______________________________________________________________
> 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]
>

John
KB4OIF
Proud Vietnam Vet
Freedom is not free, someone paid!!!
There would be no freedom without the military........
In GOD, we trust.

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Correction: I believe that there are conditions where you would have 240
volts on the fuse in a standard single phase 240v circuit so it's best to
use the standard 250v fuses. Of course 250v fuses are also fine with 120v
amp wiring but the amperage will double.

GL

John KK9A

-----Original Message-----
From: [hidden email] [mailto:[hidden email]]
Sent: Saturday, July 14, 2018 6:37 PM
To: 'Elecraft Reflector'
Subject: [Elecraft] new owner looking for fuses.

230v fuses are perfect. Most people in the US will not have more than 120v
on each fuse even when running 240v. I am not sure why slow blow was
recommended, is that what the manual says? These fuses are easy to find, if
you don't see them locally try Mouser.

This IS the forum for Elecraft products, even though it doesn't always seem
that way.

John KK9A




On 7/14/2018 1:43 PM, John Clemmer wrote:

> Hello.  new owner of a KPA 500 and KAT 500.  Previous owner is a good
friend of mine.  He had 220 in his shack. He had 6 amp fuses in it.    I
have 110 and am looking hard for fuses for the KPA 500.  Manual says two 12
amp fuses for 115V.  tech said use slow blow ones.  Any suggestions.  Can't
seem to find a forum for Elelecraft.  Will 12 amp 230 v work????

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[ANDY DURBIN]

"Of course 250v fuses are also fine with 120v amp wiring but the amperage will double."


There is so much more to learn when the discussion gets back on topic!


Andy k3wyc
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[Don Wilhelm]

Where did that come from?  The amperage of the fuse will be the same
whether used on 120 or 240 volts.

Maybe you are thinking of power rating, but that has nothing to do with it.

73,
Don W3FPR

On 7/14/2018 10:21 PM, [hidden email] wrote:
> Correction: I believe that there are conditions where you would have 240
> volts on the fuse in a standard single phase 240v circuit so it's best to
> use the standard 250v fuses. Of course 250v fuses are also fine with 120v
> amp wiring but the amperage will double.
>
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[Vic Rosenthal]

This is incorrect!
The current rating of a fuse is independent of the voltage.
The fuse blows as a result of heat, which is proportional to I squared times R.
The voltage rating is just a guarantee that if it does blow, it won’t stay conductive due to an arc.

Victor 4X6GP

> On 15 Jul 2018, at 5:21, <[hidden email]> <[hidden email]> wrote:
>
> Correction: I believe that there are conditions where you would have 240
> volts on the fuse in a standard single phase 240v circuit so it's best to
> use the standard 250v fuses. Of course 250v fuses are also fine with 120v
> amp wiring but the amperage will double.
>
> GL
>
> John KK9A
>

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[Don Wilhelm]

Actually, if you have the part numbers, the quickest way is to phone
831-763-4211 and talk with the sales folks, they can take your part
number information and obtain your credit card information in a few
minutes.  Give them a bit of a break, things get quite busy on Monday
mornings, so try to avoid that time frame.

Yes, you can order on-line too.

73,
Don W3FPR

On 7/14/2018 8:05 PM, Mark E. Musick wrote:
> John,
> Just send an e-mail to Elecraft sales.
> Give them the Elecraft part numbers I sent you and the quantity you want. Tell them you need instructions on how to purchase them through the website.
> They will reply to you with their current price and how to order them through the Elecraft website.
> It has been so long I have forgotten how I ordered them through the website. I'd have to ask them again myself, if I needed replacements.
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[Josh Fiden]

He said "amperage will double with 120v amp wiring" meaning that if you run the amp at 120 instead of 240, current is doubled.

73
Josh W6XU

Sent from my mobile device

> On Jul 14, 2018, at 9:55 PM, Don Wilhelm <[hidden email]> wrote:
>
> Where did that come from?

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[Jim Brown-10]

On 7/14/2018 9:57 PM, Vic Rosenthal wrote:
> The current rating of a fuse is independent of the voltage.
> The fuse blows as a result of heat, which is proportional to I squared times R.
> The voltage rating is just a guarantee that if it does blow, it won’t stay conductive due to an arc.

Exactly right. AND -- the breaker at the panelboard protects the entire
circuit against faults that could be unsafe for personnel or might start
a fire.

By contrast, the fuses in the KPA protect the amplifier, NOT the
circuit, from a condition where the amp is drawing too much current, and
could destructively fail. SO fuses for 240V operation are specified for
half the current of fuses for 120V operation (because normal current
draw is half at 240V as compared to 120V).

I buy my fuses from the usual suspect electronic distributors, and I've
always kept a stash of standard values.

73, Jim K9YC

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[Roy Koeppe]

One reason 'all fuses' aren't just rated at 250v to be done with it is that
a shorter element section in a lower voltage fuse can have a lower
resistance, due to the shorter arc gap allowed. Thus lower voltage drop for
a low voltage circuit, etc.

73,   Roy    K6XK





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[K9MA]

Also, fuses rated 250 V AC are typically rated only 32 V DC.  That's
because, with AC, the current goes to zero twice per cycle, so the arc
can go out. Not so with DC. I suspect the standard 28 V DC once used in
many aircraft was chosen because that's about the highest voltage which
can be switched with a mechanical relay or switch. (Something about the
energy required to strip electrons from the metal contacts.) Solid-state
switches, of course, don't have that problem, hence the popularity of
higher voltage DC systems now.

Long ago, I put a 3AG fuse in series with the finals' cathodes of a
T-4XB. The first step in replacing that fuse when it blew was to shake
all the glass out of the radio.

73,
Scott K9MA



On 7/15/2018 05:22, Roy Koeppe wrote:

> One reason 'all fuses' aren't just rated at 250v to be done with it is
> that a shorter element section in a lower voltage fuse can have a
> lower resistance, due to the shorter arc gap allowed. Thus lower
> voltage drop for a low voltage circuit, etc.
>
> 73,   Roy    K6XK
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
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> Message delivered to [hidden email]

--
Scott  K9MA

[hidden email]

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I did not state the fuse current rating is dependent on the voltage, only that you will need much higher amperage fuses (according to Georg Ohm) if you changed the wiring of a 240v amp to 120v.

 

John KK9A

 

From: Vic Rosenthal [mailto:[hidden email]]
Sent: Sunday, July 15, 2018 12:58 AM
To: [hidden email]
Cc: Elecraft Reflector
Subject: Re: [Elecraft] new owner looking for fuses.

 

This is incorrect!

The current rating of a fuse is independent of the voltage.

The fuse blows as a result of heat, which is proportional to I squared times R.

The voltage rating is just a guarantee that if it does blow, it won’t stay conductive due to an arc.

 

Victor 4X6GP


On 15 Jul 2018, at 5:21, <[hidden email]> <[hidden email]> wrote:

Correction: I believe that there are conditions where you would have 240
volts on the fuse in a standard single phase 240v circuit so it's best to
use the standard 250v fuses. Of course 250v fuses are also fine with 120v
amp wiring but the amperage will double.

GL

John KK9A

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[Bob McGraw - K4TAX]

Hence the reason for 3AC fuses.  They have a ceramic body and don't explode.  Of course the only way to tell if they are open is to measure them.

Bob, K4TAX


Sent from my iPhone

> On Jul 15, 2018, at 10:18 AM, K9MA <[hidden email]> wrote:
>
> Also, fuses rated 250 V AC are typically rated only 32 V DC.  That's because, with AC, the current goes to zero twice per cycle, so the arc can go out. Not so with DC. I suspect the standard 28 V DC once used in many aircraft was chosen because that's about the highest voltage which can be switched with a mechanical relay or switch. (Something about the energy required to strip electrons from the metal contacts.) Solid-state switches, of course, don't have that problem, hence the popularity of higher voltage DC systems now.
>
> Long ago, I put a 3AG fuse in series with the finals' cathodes of a T-4XB. The first step in replacing that fuse when it blew was to shake all the glass out of the radio.
>
> 73,
> Scott K9MA
>
>
>
>> On 7/15/2018 05:22, Roy Koeppe wrote:
>> One reason 'all fuses' aren't just rated at 250v to be done with it is that a shorter element section in a lower voltage fuse can have a lower resistance, due to the shorter arc gap allowed. Thus lower voltage drop for a low voltage circuit, etc.
>>
>> 73,   Roy    K6XK
>>
>>
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>> 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]
>
>
> --
> Scott  K9MA
>
> [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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[Bill Frantz]

I suppose you could put a NE-2 bulb and a resistor in parallel
with the fuse. Just not when the fuse is protecting your house
wiring. Then if the amp tries to draw current, the bulb will
glow when the fuse is open.

73 Bill AE6JV

On 7/15/18 at 10:49 AM, [hidden email] (Bob McGraw K4TAX) wrote:

>Hence the reason for 3AC fuses.  They have a ceramic body and
>don't explode.  Of course the only way to tell if they are open
>is to measure them.

-----------------------------------------------------------------------
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[K9MA]

On 7/15/2018 12:49, Bob McGraw K4TAX wrote:
> Hence the reason for 3AC fuses.  They have a ceramic body and don't explode.  Of course the only way to tell if they are open is to measure them.
>
> Bob, K4TAX

It was a long time ago, but I think we blew up some of those, too.

73,

Scott K9MA

--
Scott  K9MA

[hidden email]

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[Bill Frantz]

I remember blowing up NE-2s, but only when I didn't have a
current limiting resistor.

73 Bill AE6JV

On 7/15/18 at 10:58 AM, [hidden email] (K9MA) wrote:

>On 7/15/2018 12:49, Bob McGraw K4TAX wrote:
>>Hence the reason for 3AC fuses.  They have a ceramic body and don't explode.  Of course the only way
>to tell if they are open is to measure them.
>>
>>Bob, K4TAX
>
>It was a long time ago, but I think we blew up some of those, too.
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[Vic Rosenthal]

Sorry, I misunderstood. You are quite right that the current drawn at the lower voltage will be double for the same power output.

Victor 4X6GP

> On 15 Jul 2018, at 18:38, <[hidden email]> <[hidden email]> wrote:
>
> I did not state the fuse current rating is dependent on the voltage, only that you will need much higher amperage fuses (according to Georg Ohm) if you changed the wiring of a 240v amp to 120v.
>  
> John KK9A
>  
> From: Vic Rosenthal [mailto:[hidden email]]
> Sent: Sunday, July 15, 2018 12:58
> To: [hidden email]
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] new owner looking for fuses.
>  
> This is incorrect!
> The current rating of a fuse is independent of the voltage.
> The fuse blows as a result of heat, which is proportional to I squared times R.
> The voltage rating is just a guarantee that if it does blow, it won’t stay conductive due to an arc.
>  
> Victor 4X6GP
>
> On 15 Jul 2018, at 5:21, <[hidden email]> <[hidden email]> wrote:
>
> Correction: I believe that there are conditions where you would have 240
> volts on the fuse in a standard single phase 240v circuit so it's best to
> use the standard 250v fuses. Of course 250v fuses are also fine with 120v
> amp wiring but the amperage will double.
>
> GL
>
> John KK9A

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[John Clemmer]

Hello Don.  when I talked to the guy at elecraft, I am almost positive he said slow blow fuses.  In the manual' it says 3 AG fast blow.  Really confused here.  Looked at the power cord that Mike sent with the amp.  It's a 220 power cord.  Ordered a heavy duty 15 amp power cord today.  I have a 10 amp but don't think it is heavy duty like the guy said to use.


Does elecraft have a way of ordering replacement parts or a source where they get their parts.

KB4OIF

John

> On July 14, 2018 at 2:04 PM Don Wilhelm <[hidden email]> wrote:
>
>
> John yes, 12 amp 240 volts will work fine.  The voltage rating for a
> fuse is "any voltage up to the rated voltage".
>
> The manual statement to use "12A fuses for 115V" does NOT mean that the
> fuses must be rated for 115V.
>
> 73,
> Don W3FPR
>
>
> On 7/14/2018 1:43 PM, John Clemmer wrote:
> > Hello.  new owner of a KPA 500 and KAT 500.  Previous owner is a good friend of mine.  He had 220 in his shack. He had 6 amp fuses in it.    I have 110 and am looking hard for fuses for the KPA 500.  Manual says two 12 amp fuses for 115V.  tech said use slow blow ones.  Any suggestions.  Can't seem to find a forum for Elelecraft.  Will 12 amp 230 v work????

John
KB4OIF
Proud Vietnam Vet
Freedom is not free, someone paid!!!
There would be no freedom without the military........
In GOD, we trust.
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