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In Reply to: RE: Missing parafeed caps in the schems posted by nullspace on October 08, 2009 at 08:34:55
>Unless I'm mistaken (50-50 chance, I suppose), getting rid of the >parafeed caps is the whole point of ensuring that both tubes draw the >same DC current (in this case, 60mA for the 2A3s), so they are >purposefully left out of the schematic.
I don't think that is correct. Where plate, choke and transfomers met there are 300V or so: there is a path to ground through the transformer windings which is low DCR... I assume a couple of amperes would be flowing in each coil of the OPT and burn them. AC world gets even more complex.
Again, I am much impressed by simple circuits and I like yours and I'd make it even simpler.
A direct comparison parafeed/series feed would be a great experience to share. Please do keep us posted.
I will somehow recycle your driver stage for my DAC ... I got 5 6EW7s on the bay last night after your posts, would you mind givind details on plate voltage you are running the 6EW7 at?
OH! I love my beeseven in nickel ... they need special care being sensitive to pick up but those are the input tranny I prefer (I tried sowter, cinemag which are great too, lundhal, vintage altecs). All were nickel/amorphous (not sure about altecs) ... I am trying to put my hands on some UTCs or Peerless but they are utterly expensive
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