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Dynaco-Doctor Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Direct input to ST-70 posted by hvlee on April 3, 2020 at 15:53:12:
The Van Alstine filter is not really needed, IMO. There's a simpler way. Here's the fairly recent, landmark lab study by Dave Gillespie of the original Stereo 70 circuit... the entire document is a "must read," but regarding the DC offset thing, have a look at the top third of page 10, where Dave provides a simple procedure for adding DC blocking capacitors to the Stereo 70 inputs:
Edits: 05/08/20 05/08/20
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Follow Ups
- RE: Direct input to ST-70 - petercapo 17:10:12 05/08/20 (21)
- RE: Direct input to ST-70 - hvlee 17:31:19 05/08/20 (20)
- RE: Direct input to ST-70 - petercapo 06:52:30 05/09/20 (19)
- "I'm not crazy about the idea of swapping out the original circuit design for a different one" - 1973shovel 08:00:28 06/27/20 (15)
- RE: "I'm not crazy about the idea of swapping out the original circuit design for a different one" - petercapo 11:49:31 06/27/20 (14)
- RE: "I'm not crazy about the idea of swapping out the original circuit design for a different one" - Mushroom Soup 18:38:11 03/05/21 (0)
- Transistors? - 1973shovel 16:50:47 06/27/20 (12)
- RE: Transistors? - petercapo 17:08:03 06/27/20 (11)
- RE: Transistors? - 1973shovel 21:33:28 06/27/20 (10)
- RE: Transistors? - petercapo 03:46:23 06/28/20 (9)
- RE: Transistors? - 1973shovel 06:35:26 06/30/20 (8)
- Reimagined Dynacos - petercapo 06:44:09 06/30/20 (7)
- That's a good question - 1973shovel 13:34:43 07/02/20 (6)
- RE: That's a good question - petercapo 14:17:35 07/02/20 (5)
- I will post my results - 1973shovel 06:57:00 07/03/20 (4)
- Looks Great! (nt) - petercapo 13:18:23 07/03/20 (3)
- I hope mine turns out as well - 1973shovel 17:32:13 07/04/20 (2)
- Jed Clampett's property? - petercapo 18:32:52 07/04/20 (1)
- Uncle Jed's Black Gold is the only oil I will use in my capacitors - 1973shovel 07:36:10 07/06/20 (0)
- RE: Direct input to ST-70 - hvlee 09:49:58 05/09/20 (2)
- RE: Direct input to ST-70 - petercapo 13:09:58 05/09/20 (1)
- RE: Direct input to ST-70 - hvlee 13:54:12 05/09/20 (0)
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