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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: How much current does a -bias voltage need for 6550 tubes posted by DAK on July 18, 2016 at 21:01:41:
Dak
It depends what voltage you are running tubes at on the plate but when you are in 440vdc to 470vdc range,I usually bias at 75ma to 80ma.You typically need about minus 47 to minus 57v on the control grid.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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Follow Ups
- RE: How much current does a -bias voltage need for 6550 tubes - Michael Samra 21:30:58 07/18/16 (15)
- RE:I am talking about current needed for the bias supply - DAK 22:23:31 07/18/16 (14)
- Very little if you speak of the power supply - Michael Samra 10:52:45 07/19/16 (0)
- Not much - FenderLover 23:04:15 07/18/16 (12)
- "few hundreds of mA, max." - Chip647 05:07:44 07/19/16 (11)
- RE: My amp is PP class A - DAK 11:24:53 07/19/16 (7)
- This is a fixed bias, Class "A" amp? - FenderLover 22:03:06 07/19/16 (6)
- RE: This is a fixed bias, Class "A" amp? - PakProtector 03:38:14 07/20/16 (5)
- RE: With EL34 I am using -30v for 60ma/tube - DAK 09:34:28 07/20/16 (2)
- RE: With EL34 I am using -30v for 60ma/tube - FenderLover 10:00:04 07/20/16 (1)
- RE: Thank you for that info. - DAK 14:28:47 07/20/16 (0)
- RE: This is a fixed bias, Class "A" amp? - FenderLover 06:58:39 07/20/16 (1)
- RE: This is a fixed bias, Class "A" amp? - PakProtector 14:35:34 07/21/16 (0)
- RE: "few hundreds of mA, max." - FenderLover 06:51:45 07/19/16 (2)
- RE: "few hundreds of mA, max." - Jim McShane 08:02:59 07/19/16 (1)
- It is simple - PakProtector 10:52:38 07/19/16 (0)
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