[sdiy] HV capacitors for tube amp

cheater00 . cheater00 at gmail.com
Sat Mar 26 15:25:29 CET 2016


I have looked around and have found MKT capacitors of acceptable size; is
there any reason I wouldn't use MKT?

Thanks

On Sat, 26 Mar 2016 15:23 cheater00 ., <cheater00 at gmail.com> wrote:

> Sorry, I was sure I had said the capacitance was 10uF, but I guess
> something around that ballpark is fine.
>
> On Sat, 26 Mar 2016 15:20 Jay Schwichtenberg, <jays at aracnet.com> wrote:
>
>> There are places that still sell parts for both music and audiophile tube
>> amps. So check the internet.
>>
>>
>>
>> Here's one:
>>
>> https://www.tubesandmore.com/
>>
>>
>>
>> Jay S.
>>
>>
>>
>> *From:* Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] *On
>> Behalf Of *Richie Burnett
>> *Sent:* Saturday, March 26, 2016 1:21 AM
>> *To:* synth-diy; cheater00 .
>> *Subject:* Re: [sdiy] HV capacitors for tube amp
>>
>>
>>
>> 450v is high for modern electrolytics. You can use two lower voltage and
>> larger capacitance caps in series with balance resistors if necessary.
>>
>> You didn't say what the capacitance was, but you might be able to find
>> plastic film caps with a large enough capacitance. Power factor correction
>> capacitors (PFC) are film-foil construction, up to 450VAC and low loss, but
>> they are likely to be physically much larger than the equivalently rated
>> electrolytic capacitors.
>>
>> Anything marked low-ESR and rated 105'C from the likes of Panasonic,
>> Rubycon, Vishay/BC components, or Nippon-Chemicon should be decent quality.
>>
>> -Richie,
>>
>> P.S. Be careful, the stored energy is very likely lethal at those
>> voltages!
>>
>> Sent from my Xperia SP on O2
>>
>> ---- cheater00 . wrote ----
>>
>> Hi guys,
>>
>> I have to replace the DC HV filter capacitors on my Mesa head. They're
>> 450V electrolytics running at maybe 420V and have a footprint of 12mm at
>> the base. They dried out after ~6 years. I would like to replace them with
>> good ones that have very low ESR in the audio range. This amp has a problem
>> where gain stages leak to each other, and I suspect that happens through
>> the HV bus. If need be I can use capacitors with a different footprint, I
>> could build a scaffold since everything is TH.
>>
>>
>>
>> Is there anything that would suggest against using MKT capacitors here?
>>
>>
>>
>> I also thought about using pairs of large and small capacitor to
>> compliment frequency response of impedance.
>>
>>
>>
>> Links to suppliers or part #'s would be great.
>>
>>
>>
>> Thanks
>>
>
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