In Reply to: Now it's back to its bad ways. posted by DAK on January 12, 2017 at 16:41:41:
You only need voltage. You can bias these tubes with less than 5mA. Sounds like you have a bad cap in the bias circuit that is drawing current. That or a bad transformer.
Edits: 01/12/17 01/12/17
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Follow Ups
- enough current to bias 2 x kt150 tubes You don't need current - Chip647 16:50:03 01/12/17 (27)
- RE: enough current to bias 2 x kt150 tubes - DAK 17:08:46 01/12/17 (26)
- RE: enough current to bias 2 x kt150 tubes - 6AS7_6SN7 23:10:22 01/12/17 (1)
- RE: enough current to bias 2 x kt150 tubes - DAK 09:56:50 01/13/17 (0)
- Unstable amp - FenderLover 17:43:26 01/12/17 (23)
- RE: Hi FL. can you contact me offline? - DAK 19:23:34 01/13/17 (0)
- RE: Unstable amp - DAK 19:37:39 01/12/17 (21)
- RE: Unstable amp - PakProtector 04:38:44 01/14/17 (20)
- Powered it up WITHOUT the driver tubes...still misbehaving - DAK 13:09:40 01/14/17 (18)
- RE: Powered it up WITHOUT the driver tubes...still misbehaving - PakProtector 03:34:18 01/15/17 (6)
- RE:What would i be looking for in the meter readings? nt - DAK 23:27:00 01/15/17 (5)
- RE:What would i be looking for in the meter readings? nt - PakProtector 03:48:33 01/16/17 (4)
- RE:What would i be looking for in the meter readings? nt - DAK 08:08:19 01/16/17 (3)
- RE:What would i be looking for in the meter readings? nt - PakProtector 08:38:46 01/16/17 (2)
- I was not being facetious or disrespectful. - DAK 11:44:11 01/16/17 (1)
- RE: I was not being facetious or disrespectful. - PakProtector 16:41:14 01/16/17 (0)
- RE: Powered it up WITHOUT the driver tubes...still misbehaving - Tre' 16:20:34 01/14/17 (10)
- Residual AC in the bias supply is .002v - DAK 15:22:48 01/15/17 (9)
- RE: Residual AC in the bias supply is .002v - Tre' 16:07:07 01/15/17 (5)
- Where would i put the ferrite beads? - DAK 22:52:30 01/15/17 (4)
- RE: Where would i put the ferrite beads? - Tre' 08:27:00 01/16/17 (3)
- RE: Where would i put the ferrite beads? - DAK 11:50:08 01/16/17 (2)
- RE: Where would i put the ferrite beads? - Tre' 19:14:58 01/16/17 (1)
- It helped a little. - DAK 20:47:41 01/16/17 (0)
- RE: Residual AC in the bias supply is .002v - Michael Samra 16:06:40 01/15/17 (2)
- Both coupling caps are new Mundorf Silver/gold and oil - DAK 23:08:58 01/15/17 (1)
- RE: Both coupling caps are new Mundorf Silver/gold and oil - Michael Samra 12:06:23 01/16/17 (0)
- RE:You mean run the amp w/out the driver tube? - DAK 08:47:42 01/14/17 (0)