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In Reply to: RE: DC coupled 2A3 amp with two rectifier tubes.... posted by fvale on April 13, 2009 at 04:57:14
It should be safe as you describe, though I too would try to avoid any relay circuits. If you're really concerned, a damper diode for the 2A3 stage would perform the same function.
By the way, I tried a Telefunken 6V4 years ago and it was pure garbage, IMO. I like the 6X4 though - especially the Tungsol military version.
Michael,In an ideally constructed SE amplifier, I find that TV Damper Diodes are not a panacea. The TV Damper Diode's cathode, which gives such a nice long, slow gentle start up, has a downside. In a well executed amp, the NON cathode rectifier ( directly heated rectifiers, or DHRs) will inherently have better nuancing and layering of the music, even though the TV diodes have lower DCR.
To effectively obtain lower DCR in DHRs, without the subtle loss of nuance information inherent with cathode rectifiers, we parallel the plates on the DHRs and use two dual diode tubes.
YMMV, this is just what I have found, and others, in listening tests.
Jeff Medwin
Edits: 04/20/09
"In an ideally constructed SE amplifier, I find that"
hubris
Thanks Michael. How do damper diodes work? I never used one!
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