<p dir="ltr">having survived 720V to the finger while building a tube amp it's maybe not lethal but not fun either.</p>
<p dir="ltr">just remember the old rule of HV debugging: always keep one hand in your pocket</p>
<div class="gmail_quote">On Mar 26, 2016 9:24 AM, "Richie Burnett" <<a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">450v is high for modern electrolytics. You can use two lower voltage and larger capacitance caps in series with balance resistors if necessary.<br><br>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.<br><br>Anything marked low-ESR and rated 105'C from the likes of Panasonic, Rubycon, Vishay/BC components, or Nippon-Chemicon should be decent quality.<br><br>-Richie,<br><br>P.S. Be careful, the stored energy is very likely lethal at those voltages!<br><br>Sent from my Xperia SP on O2<br><br>---- cheater00 . wrote ----<br><br>Hi guys,<div>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.</div><div><br></div><div>Is there anything that would suggest against using MKT capacitors here?</div><div><br></div><div>I also thought about using pairs of large and small capacitor to compliment frequency response of impedance.</div><div><br></div><div>Links to suppliers or part #'s would be great.</div><div><br></div><div>Thanks</div>
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