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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: re: rolled off HF response posted by Lew on December 1, 2005 at 08:26:38:
You may be on to something. I just removed the current sources from the cathodes of the drivers. They were set at 6mA. I now am operating the tube with just a 22k resistor in each cathode for about 10mA. The treble is much improved. I guess the 6550 in triode mode is harder to drive (Miller?) than I thought. I'll need to find a tube with adequate B+ capacity though, since B+ is 390V and the grid is direct coupled to the cascode plate at 180V. I think the ECC99 was 150V max. I'll check the 5687. Thanks.
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Follow Ups
- Re: re: rolled off HF response - Slick 12/2/0505:53:12 12/2/05 (9)
- Oh, I see now your problem - Lew 11:31:17 12/2/05 (7)
- Re: Oh, I see now your problem - Slick 13:02:21 12/2/05 (6)
- Re: low mu - Ralph 13:32:30 12/2/05 (5)
- what Ralph said, plus - Lew 07:19:52 12/5/05 (4)
- Re: what Ralph said, plus - Slick 08:02:42 12/6/05 (3)
- Re: what Ralph said, plus - Lew 07:58:07 12/7/05 (0)
- Re: what Ralph said, plus - Ralph 12:49:22 12/6/05 (1)
- Re: what Ralph said, plus - Slick 04:04:57 12/7/05 (0)
- Re: re: rolled off HF response - Lew 07:35:32 12/2/05 (0)
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