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In Reply to: More circuits. posted by Poindexter on September 05, 2004 at 21:15:09:
This should be it. Here's a link:http://tinpan.fortunecity.com/saints/668/primer/
and here's the schematic:
http://tinpan.fortunecity.com/saints/668/primer/300b-se.gif
I can't read it but I'm told the only difference between the vtv and the fi primer is that with the vtv the output comes off from the cathode rather than the plate.
Sounds to me like they have similar and important characteristics for us space travelers. I find this characteristic "essential".
Follow Ups:
Thanks, John,The Fi Primer, Foreplay, and VTV circuits look all very similar, also the PAS3 and dozens of others; A plate-loaded amp followed (usually direct coupled) to a cathode follower. I am not myself wild about the distinctive sonic signature of cathode followers, although I don't think I dislike them as much as Allen Wright seems to. Maybe they can be made better by proper implementation, haven't tried it myself.
Right now I'm adjusting circuit parameters on the PP breadboard; and even with dime-each Hammond outputs, it's giving me some of the best sound I've heard. I gots to go talk to Kevin, and get some Lundahls in there.
Thanks again,
Poinz
Yes, almost identical to the JE Labs 300B, in fact. As a side note, I will add that I've used a number of variations on the 6SN7 and while it is a nice tube, to me it always requires two stages with a 300B (I supposed you could transformer couple it and get away from that). I prefer the sound of a one-stage driver and have used the 6N1P with choke load and CCS very well. But late last week I started to play with a 417A... wow, now this is a nice sounding tube. My circuit is B+ = 230v, 10K plate resistor (12w mills), Vp = 130v, 200 ohm cathode resistor, 10ma of current. Cap coupled to a 2A3, but would work for a 300B as well. Very deep sound stage, very musical.
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