<p dir="ltr">Sorry, I was sure I had said the capacitance was 10uF, but I guess something around that ballpark is fine.</p>
<br><div class="gmail_quote"><div dir="ltr">On Sat, 26 Mar 2016 15:20 Jay Schwichtenberg, <<a href="mailto:jays@aracnet.com">jays@aracnet.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">There are places that still sell parts for both music and audiophile tube amps. So check the internet.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Here's one:<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="https://www.tubesandmore.com/" target="_blank">https://www.tubesandmore.com/</a><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Jay S.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Synth-diy [mailto:<a href="mailto:synth-diy-bounces@dropmix.xs4all.nl" target="_blank">synth-diy-bounces@dropmix.xs4all.nl</a>] <b>On Behalf Of </b>Richie Burnett<br><b>Sent:</b> Saturday, March 26, 2016 1:21 AM<br><b>To:</b> synth-diy; cheater00 .<br><b>Subject:</b> Re: [sdiy] HV capacitors for tube amp<u></u><u></u></span></p></div></div></div><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">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,<u></u><u></u></p><div><p class="MsoNormal">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.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Is there anything that would suggest against using MKT capacitors here?<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">I also thought about using pairs of large and small capacitor to compliment frequency response of impedance.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Links to suppliers or part #'s would be great.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Thanks<u></u><u></u></p></div></div></div></blockquote></div>