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In Reply to: RE: JJ EZ81 issues? posted by BofService on April 08, 2015 at 12:50:12
You could try putting some 1N4007s in line with the high voltage leads if it is a PIV issue
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Hmmm.
Here are links to a schematic and the tube data sheet. I'm not technical enough to understand exactly what is happening when the tube first starts to conduct, but looks like it is well within limits at steady state.
http://vintagevacuumaudio.com/schematics-manuals/eico/eico-hf-30-service-manual-schematics.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6CA4.pdf
Thanks!
"Here are links to a schematic and the tube data sheet. I'm not technical enough to understand exactly what is happening when the tube first starts to conduct, but looks like it is well within limits at steady state."With a cap input filter each diode is only on for a small portion of it's half cycle so there is no steady state. (turn on surge is a separate matter)
50uf is fine as long as the "total plate supply resistance per plate" is met.
(see page page 2 of http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6CA4.pdf and my post above)
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 04/08/15 04/08/15
With solid state diodes in parallel, the B+ will be INSTANTLY on, before other tubes warm up their filaments.
JM
He said SERIES. I posted a link in another branch of this thread.
Eli D.
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