[sdiy] HV capacitors for tube amp

[cheater00 .]

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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