[Amps] To rewind or not? (3KA resonant filter choke)

[Jim Barber]

Good idea with the scope, thanks. I do have a 100:1 5KV probe, but 
haven't used it on a 4KV supply before. I have to admit I'm nervous 
about that. I just bought a DSO and the new scope smell hasn't worn off 
yet...

I've collected the parts, but haven't as yet finished my hipot tester. 
That will probably have to wait until the CNC gear is running again ao 
that I can mill the (3/4" acrylic) front panel and cabinet. We're 
finally getting around to finishing the shop after the last move, so I 
won't have an excuse much longer.

It'll take me a few days to get back to the amp, but when I do I'll grab 
a few images from the DSO and post them on a website for comment. Other 
than some faster-risetime scritch under modulation if there's a problem 
I'm not 100% sure what to look for.

73
Jim N7CXI

On 1/5/2012 9:00 AM, Carl wrote:
> Id start with a scope and see what is happening as well as doing a hi
> pot on the resonating and filter cap. Also measure the resonating cap;
> if its drifted up then the circuit could be resonant too close to 120Hz.
>
> Dont forget to crank down on the choke lamination hardware.
>
> Carl
> KM1H
>
>
>
>
> ----- Original Message ----- From: "Jim Barber" <audioguy at q.com>
> To: <amps at contesting.com>
> Sent: Wednesday, January 04, 2012 5:41 AM
> Subject: [Amps] To rewind or not? (3KA resonant filter choke)
>
>
>> The "chatter" from my Henry 3KA's resonant filter choke is worrying
>> me, so I'm wondering whether to have it rewound and replace the cap,
>> do that and also rewind the plate xformer, or just throw it all out
>> and stick in a more modern 3KV 1A xformer, a bridge and a larger
>> filter cap. By the time I pay to ship the iron aound the country I
>> suspect the last option may be the least expensive, but price isn't
>> necessarily the only consideration here. I want to run it on a regular
>> basis for another 20 years, and perform as well as it does now.
>>
>> Opinions?
>>
>> Thanks,
>> Jim, N7CXI
>>
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