[sdiy] HV capacitors for tube amp

[Jay Schwichtenberg]

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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