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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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Hey all.
I'm currently working on a tube phono stage. It has a single power supply, and 4 KandK CCS's, feeding current to four C3G pentodes (wired as triodes).
As part of the setup, I configured all four CCS's using a 9V battery, and a 10ohm resistor, and configured each of them for 18ma. This will give the tubes about 180V on the plate, and a bias of about 2.5V (there's a 130ohm resistor on the cathode)
Once powered up, three of the tubes show "correct" values (they bias at 2.3V, and have between 165 - 180V in the plate, which I put down to tube variation).
The last tube, however, is biasing at 3V, with 220V on the plate.
I tried different tubes, but the problem didn't follow the tube.
I removed the CCS, and tried testing it with a battery and resistor, and it measured fine.
Can't think of what else to check ?
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Topic - Help with CCS ? - MichaelM 05:19:57 06/06/12 (19)
- RE: Help with CCS ? - MichaelM 23:21:36 06/09/12 (1)
- RE: Help with CCS ? - KevinC 03:07:22 06/10/12 (0)
- RE: Help with CCS ? - KevinC 10:22:15 06/06/12 (16)
- RE: Help with CCS ? - Tre' 08:08:46 06/07/12 (15)
- RE: Help with CCS ? - MichaelM 16:40:44 06/07/12 (14)
- RE: Help with CCS ? - KevinC 17:02:46 06/07/12 (13)
- RE: Help with CCS ? - MichaelM 17:18:29 06/07/12 (12)
- RE: Help with CCS ? - KevinC 19:08:07 06/07/12 (11)
- RE: Help with CCS ? - MichaelM 04:19:28 06/20/12 (10)
- RE: Help with CCS ? - KevinC 07:23:07 06/20/12 (9)
- RE: Help with CCS ? - MichaelM 17:21:54 06/20/12 (8)
- RE: Help with CCS ? - MichaelM 03:18:43 06/22/12 (5)
- RE: Help with CCS ? - KevinC 11:00:40 06/23/12 (4)
- RE: Help with CCS ? - MichaelM 18:30:01 06/23/12 (3)
- RE: Help with CCS ? - KevinC 18:53:35 06/25/12 (2)
- RE: Help with CCS ? - MichaelM 05:27:14 08/05/12 (1)
- RE: Help with CCS ? - grufti 22:00:39 08/11/12 (0)
- RE: Help with CCS ? - Palustris 11:39:14 06/21/12 (0)
- RE: Help with CCS ? - KevinC 07:29:38 06/21/12 (0)
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