[sdiy] HV capacitors for tube amp

[Vladimir Pantelic]

having survived 720V to the finger while building a tube amp it's maybe not
lethal but not fun either.

just remember the old rule of HV debugging: always keep one hand in your
pocket
On Mar 26, 2016 9:24 AM, "Richie Burnett" <rburnett at richieburnett.co.uk>
wrote:

> 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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