Some time back I built a 71a preamp with 100 year old Cunningham tubes. This 01a amp is similar but these tubes have more gain. Once more Cunningham tubes. Regulated DC of course on the heaters and a resistor divider to balance the voltage further. Has its own RFI/EMI power filter for a cleaner mains. Hammond power tranni.Mundorf EVO Oils for output caps and remote control Alps Blue velvet pot. Fine silver plated copper wire for hookup and mostly carbon film resistors. Remote PS with double Pi filter for HT. 300uf of 400V filter caps. Had some hum issues but by reducing the gain managed to get this right down. Love the colour - Iron Stone - and the look. Excellent to listen to.
| retro-thermionic |
Edits: 02/13/25 02/13/25 02/13/25 02/13/25 02/13/25
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Topic - DHT 01a tube preamp - mwhouston 16:27:18 02/13/25 (54)
- Back in the day when those tubes were being made - Ralph 10:05:55 02/20/25 (0)
- RE: DHT 01a tube preamp - xaudiomanx 15:57:59 02/19/25 (0)
- RE: DHT 01a tube preamp - FlaCharlie 08:44:08 02/14/25 (50)
- RE: DHT 01a tube preamp - mwhouston 22:02:15 02/14/25 (0)
- RE: DHT 01a tube preamp - mwhouston 16:21:08 02/14/25 (47)
- RE: DHT 01a tube preamp - mwhouston 16:29:01 02/14/25 (46)
- Poor Design for a Preamp - Triode_Kingdom 09:51:58 02/16/25 (30)
- RE: Poor Design for a Preamp - FlaCharlie 12:17:02 02/16/25 (27)
- RE: Bartola - deafbykhorns 11:08:37 02/17/25 (3)
- I bet that works good - Tre' 13:34:15 02/17/25 (2)
- RE: I bet that works good - Triode_Kingdom 16:48:57 02/17/25 (1)
- Yup! nt - Tre' 17:15:13 02/17/25 (0)
- RE: Poor Design for a Preamp - Tre' 12:57:28 02/16/25 (22)
- RE: Poor Design for a Preamp - mwhouston 17:55:07 02/26/25 (5)
- RE: Poor Design for a Preamp - FlaCharlie 10:19:33 02/27/25 (2)
- RE: Poor Design for a Preamp - mwhouston 14:13:55 02/27/25 (1)
- Metal Tubes / Tube Sources - FlaCharlie 10:43:52 02/28/25 (0)
- Confusion - FlaCharlie 09:50:01 02/27/25 (1)
- RE: Confusion - mwhouston 14:08:29 02/27/25 (0)
- RE: Poor Design for a Preamp - FlaCharlie 14:34:32 02/16/25 (15)
- RE: Poor Design for a Preamp - Tre' 15:22:32 02/16/25 (14)
- RE: Poor Design for a Preamp - mwhouston 19:58:38 02/16/25 (13)
- Yes, with DHTs hum can be an issue - Tre' 20:29:51 02/16/25 (12)
- RE: Yes, with DHTs hum can be an issue - mwhouston 20:34:15 02/16/25 (11)
- RE: Yes, with DHTs hum can be an issue - Tre' 20:39:48 02/16/25 (10)
- RE: Yes, with DHTs hum can be an issue - mwhouston 03:48:34 02/26/25 (2)
- RE: Yes, with DHTs hum can be an issue - FlaCharlie 06:32:38 02/26/25 (1)
- RE: Yes, with DHTs hum can be an issue - mwhouston 13:32:24 02/26/25 (0)
- RE: Yes, with DHTs hum can be an issue - mwhouston 20:51:24 02/16/25 (6)
- RE: Yes, with DHTs hum can be an issue - Tre' 21:37:40 02/16/25 (5)
- RE: Yes, with DHTs hum can be an issue - FlaCharlie 07:45:40 02/17/25 (4)
- RE: Yes, with DHTs hum can be an issue - mwhouston 16:42:17 02/19/25 (0)
- Those are all good ideas but... - Tre' 09:06:57 02/17/25 (2)
- RE: Those are all good ideas but... - mwhouston 13:50:02 02/20/25 (1)
- "I tried for months but to no avail." - Tre' 18:16:22 02/20/25 (0)
- RE: Poor Design for a Preamp - FlaCharlie 11:42:34 02/16/25 (1)
- RE: Poor Design for a Preamp - Tre' 13:18:33 02/16/25 (0)
- RE: DHT 01a tube preamp - Tre' 06:29:51 02/15/25 (14)
- RE: DHT 01a tube preamp - mwhouston 14:43:47 02/15/25 (6)
- RE: DHT 01a tube preamp - Tre' 15:10:30 02/15/25 (5)
- RE: DHT 01a tube preamp - mwhouston 15:20:48 02/15/25 (4)
- RE: DHT 01a tube preamp - Tre' 15:40:39 02/15/25 (3)
- RE: DHT 01a tube preamp - mwhouston 16:09:10 02/15/25 (2)
- RE: DHT 01a tube preamp - Tre' 16:15:25 02/15/25 (1)
- Correction - Tre' 18:29:18 02/15/25 (0)
- Output Impedance - FlaCharlie 08:33:45 02/15/25 (6)
- RE: Output Impedance - Tre' 09:22:04 02/15/25 (5)
- RE: Output Impedance - FlaCharlie 10:46:24 02/15/25 (4)
- RE: Output Impedance - Chip647 12:11:47 02/15/25 (0)
- RE: Output Impedance - Tre' 11:54:11 02/15/25 (2)
- RE: Output Impedance - FlaCharlie 13:16:19 02/15/25 (1)
- RE: Output Impedance - Tre' 13:40:12 02/15/25 (0)
- RE: DHT 01a tube preamp - GEO 10:30:03 02/14/25 (0)
- RE: DHT 01a tube preamp - GEO 08:02:44 02/14/25 (0)