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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: 845 Interstage A2 Question posted by danlaudionut on September 6, 2014 at 06:55:41:
Wow, I can't believe the number of replies recommending that you screw up such a nice design with solid state devices. Anyway, if I understand your question correctly, the bias supply doesn't need to provide any additional current. 1.5 mA should be plenty. This is one advantage to using a transformer rather than a choke. In my amps (below), the bias supply has to provide all the current that flows through the driver. In yours, quiescent bias current will be no different than a cap-coupled Class A amp. Grid current needed by the 845 when it enters A2 will be supplied by the transformer. Just be certain the cold side is solidly decoupled (bypassed).
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Follow Ups
- I Think You're Good to Go... - Triode_Kingdom 11:42:44 09/06/14 (61)
- RE: I Think You're Good to Go... - Chip647 07:33:08 09/07/14 (0)
- I don't ...RE: I Think You're Good to Go... - Paul Joppa 19:23:53 09/06/14 (57)
- RE: I don't ...RE: I Think You're Good to Go... - danlaudionut 09:44:05 09/09/14 (13)
- RE: I don't ...RE: I Think You're Good to Go... - Tre' 18:15:28 09/09/14 (12)
- RE: I don't ...RE: I Think You're Good to Go... - danlaudionut 20:16:16 09/09/14 (1)
- RE: I don't ...RE: I Think You're Good to Go... - Tre' 20:46:52 09/09/14 (0)
- RE: I don't ...RE: I Think You're Good to Go... - Paul Joppa 19:44:09 09/09/14 (9)
- RE: I don't ...RE: I Think You're Good to Go... - Tre' 21:10:09 09/09/14 (6)
- RE: I don't ...RE: I Think You're Good to Go... - Paul Joppa 22:19:05 09/09/14 (5)
- RE: I don't ...RE: I Think You're Good to Go... - Tre' 07:03:28 09/10/14 (4)
- Yes and No - Triode_Kingdom 16:52:47 09/10/14 (2)
- RE: Yes and No - Tre' 19:11:52 09/10/14 (1)
- RE: Yes and No - Triode_Kingdom 22:15:53 09/10/14 (0)
- bingo! (nt) - Paul Joppa 14:13:55 09/10/14 (0)
- RE: I don't ...RE: I Think You're Good to Go... - danlaudionut 20:21:35 09/09/14 (1)
- RE: I don't ...RE: I Think You're Good to Go... - Paul Joppa 22:32:02 09/09/14 (0)
- That's Not Correct - Triode_Kingdom 23:32:10 09/06/14 (41)
- RE: That's Not Correct - Paul Joppa 14:12:30 09/07/14 (40)
- RE: That's Not Correct - danlaudionut 15:38:27 09/07/14 (39)
- Big Oops! - Triode_Kingdom 16:09:25 09/07/14 (38)
- Only a little oops ... - Naz 00:24:17 09/08/14 (0)
- RE: Big Oops! - danlaudionut 17:34:02 09/07/14 (36)
- I Made a Mistake Once... - Triode_Kingdom 00:33:12 09/08/14 (35)
- That's wrong. - Mark Kelly 15:52:46 09/08/14 (10)
- RE: That's wrong. - Triode_Kingdom 16:21:16 09/08/14 (9)
- No point - Mark Kelly 18:52:41 09/08/14 (8)
- "fundamentally flawed topology" - Triode_Kingdom 07:42:09 09/09/14 (7)
- Love A2 as an Adjunct to A1 - Maxamillion 10:17:18 09/09/14 (6)
- RE: Love A2 as an Adjunct to A1 - Tre' 12:44:49 09/09/14 (2)
- RE: Love A2 as an Adjunct to A1 - Maxamillion 18:18:26 09/09/14 (1)
- RE: Love A2 as an Adjunct to A1 - Tre' 19:03:05 09/09/14 (0)
- RE: Love A2 as an Adjunct to A1 - Triode_Kingdom 11:25:03 09/09/14 (2)
- RE: Love A2 as an Adjunct to A1 - Maxamillion 18:20:54 09/09/14 (1)
- RE: Love A2 as an Adjunct to A1 - Triode_Kingdom 18:43:36 09/09/14 (0)
- couldn't you... - Jim Dowdy 10:18:50 09/08/14 (9)
- RE: couldn't you... - Paul Joppa 12:15:32 09/08/14 (1)
- Yah, but - Jim Dowdy 13:12:24 09/08/14 (0)
- RE: couldn't you... - Triode_Kingdom 10:36:12 09/08/14 (6)
- RE: couldn't you... - Jim Dowdy 10:49:19 09/08/14 (5)
- If you were going to draw that much current ... - Naz 15:45:36 09/08/14 (4)
- RE: If you were going to draw that much current ... - Triode_Kingdom 16:24:45 09/08/14 (1)
- RE: If you were going to draw that much current ... - Naz 18:01:06 09/08/14 (0)
- perhaps I need to re-read the entire thread... - Jim Dowdy 16:07:40 09/08/14 (1)
- The way I see it ... - Naz 16:48:55 09/08/14 (0)
- RE: I Made a Mistake Once... - Paul Joppa 08:41:06 09/08/14 (4)
- Current Flow - Triode_Kingdom 09:36:09 09/08/14 (3)
- RE: Current Flow - Paul Joppa 12:13:40 09/08/14 (2)
- Interesting Idea! - Triode_Kingdom 13:25:06 09/08/14 (1)
- RE: Interesting Idea! - Paul Joppa 18:58:36 09/08/14 (0)
- RE: I Made a Mistake Once... - danlaudionut 05:01:34 09/08/14 (5)
- Bias Regulation - Triode_Kingdom 08:44:20 09/08/14 (3)
- RE: Bias Regulation - danlaudionut 12:19:21 09/08/14 (2)
- RE: I Made a Mistake Once... - Naz 05:20:52 09/08/14 (0)
- RE: I Made a Mistake Once... - jazbo8 02:14:24 09/08/14 (2)
- RE: I Made a Mistake Once... - Triode_Kingdom 09:02:57 09/08/14 (1)
- RE: I Made a Mistake Once... - jazbo8 10:36:52 09/08/14 (0)
- RE: I don't ...RE: I Think You're Good to Go... - Naz 21:10:24 09/06/14 (0)
- RE: I Think You're Good to Go... - danlaudionut 19:05:27 09/06/14 (1)
- RE: I Think You're Good to Go... - jazbo8 06:52:50 09/07/14 (0)
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