In Reply to: Hey Tre! posted by DanK tubes on June 26, 2012 at 13:31:56:
A friend of mine built this with the help of Dennis, etc. The component values were all given to him.
I ask Dennis over the phone what the differences were between this circuit and his and he wouldn't really say. He did say that he uses multiple small by pass caps on the cathodes. My friend used only one but he used the right brand and the right size main cathode bypass caps.
Dennis complained that the current was a tiny bit to high in both the driver tube and the output tube and that the voltages were a tiny bit (and I mean a tiny bit) too.....I can't remember, I did take notes, I will have to see if I still have them.....well, high or low.
What he did say lead me to believe that it was very (my word) close.
When push came to shove Dennis said that 1" of the wrong wire will ruin the whole amplifier???!!!
I had it here for a few days. I circuit traced it and drew these schematics myself.
It's sounded awful.
On the test bench the PS was unstable even when not playing and the HF rolled off starting at 11kHz. Dennis has said (here on the AA) that his amp starts to roll off at 15kHz. He said the tubes he uses have less Miller capacitance than NOS. Dennis said (here on the AA) that his amps will start to roll off at 11kHz with Sylvania NOS 2a3's and 9kHz with RCA.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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Follow Ups
- RE: Hey Tre! - Tre' 18:15:54 06/26/12 (17)
- RE: Hey Tre! - tube wrangler 20:01:41 06/27/12 (15)
- "the proper connections into circuits are in the wrong places" - Tre' 12:45:58 06/28/12 (0)
- here's what started it - GSH 10:48:57 06/28/12 (2)
- RE: here's what started it - drlowmu 11:44:27 06/28/12 (1)
- RE: here's what started it - GSH 12:55:07 06/28/12 (0)
- RE: Hey Tre! - Tre' 10:13:21 06/28/12 (4)
- RE: Hey Tre! - tube wrangler 14:20:10 06/28/12 (3)
- RE: great advice, Dennis... - deathtube 667 05:36:54 06/29/12 (1)
- RE: great advice, Dennis... - tube wrangler 08:52:03 06/29/12 (0)
- RE: Hey Tre! - Tre' 21:00:51 06/28/12 (0)
- Sound Practices Information..... - drlowmu 21:14:01 06/27/12 (5)
- RE: Sound Practices Information..... - tube wrangler 14:40:46 06/28/12 (4)
- RE: Sound Practices Information..... - GSH 16:13:56 06/28/12 (2)
- RE: Sound Practices Information..... - tube wrangler 21:08:43 06/28/12 (0)
- RE: Sound Practices Information..... - tube wrangler 19:37:58 06/28/12 (0)
- RE: Sound Practices Information..... - Tre' 15:02:16 06/28/12 (0)
- Thanks Tre! - DanK tubes 19:49:20 06/26/12 (0)