[Amps] Building an Amp 101

[Carl]

There is nothing wrong with that bandswitch at that power and a good thing 
about the Load cap is that it has several wiper surfaces to handle the 
current unlike what is in most commercial amps. The spacing is fine for 
maybe a 3:1 VSWR of any flavor and maybe more. It is basically a pair of 
early Heath SB-200/220 TRW caps in series.

Carl
KM1H




----- Original Message ----- 
From: "Mike Waters" <mikewate at gmail.com>
To: <amps at contesting.com>
Sent: Friday, January 17, 2014 12:51 PM
Subject: Re: [Amps] Building an Amp 101


> Are we looking at the same amp? It looks like my output loading cap in my
> legal-limit amp, and it's never arced even into a high SWR.
>
> The output loading capacitor only has to handle about 300 volts.
>
> As long as the plates are aligned end-to-end, it should work OK. Just look
> through the plates at a light, and rotate it throughout its entire range.
> Check for the plates not centered or almost touching.
>
> 73, Mike
> www.w0btu.com
>
>
> On Fri, Jan 17, 2014 at 11:00 AM, <amps-request at contesting.com> wrote:
>
>> From: Bill <dezrat1242 at wildblue.net>
>> To: amps at contesting.com
>> Date: Fri, 17 Jan 2014 08:58:08 -0800
>> Subject: Re: [Amps] Building an Amp 101
>>
>> On 01/17/2014 08:23 AM, Vic Rosenthal wrote:
>>
>>> You don't need to be an expert or have a lot of special tools. Look at 
>>> my
>>> amp,
>>>
>>> <http://www.qsl.net/k2vco/4CX1000A/K2VCO%204CX1000A%20Amplifier.html>
>>>
>>> The only power tools I used were a drill press and a hand-held jigsaw (a
>>> reciprocating sander can be used to make scratched up panels look nice).
>>>
>>
>> REPLY:
>>
>> You've done a beautiful job Vic, but I have two concerns: I think both
>> your bandswitch and the output loading capacitor are seriously 
>> under-rated
>> for a legal limit amp. You didn't ask for advice, but I do want to help.
>>
>> 73, Bill W6WRT
>>
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