In Reply to: 813 set schematic posted by vinnie2 on February 10, 2019 at 09:12:26:
Decided to try an 845 first as I have a schematic for it as posted. Amazing what a difference that made. I had it up and running in about 20 minutes on the new bread board. Now this is a long ways from a finished design, I just wanted to see if I could get something working. It actually sounds pretty good. I just did the one channel for now and used a mono source. I took some measurements just to see where I am and I know things will need adjustment. You can read some of them on the schem, but just in case you can't...
B+ 500vdc
plate volts (filament to plate 370 vdc)
cath to grnd - grid to grnd (117-98= 19vdc)
plate current 64 mA (115vdc/1800 ohms)
Now I know I still would have to do a lot of work on this to get it where it should be (62mA and -51vdc grid volts), but my real question for now is should I be able to replace the 845 with an 813 an get music out the other end? I think that is what I did before, but I have no record of what I changed to get it to work.
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Follow Ups
- update.... - vinnie2 14:57:38 02/12/19 (33)
- confused again - vinnie2 06:28:42 02/13/19 (21)
- RE: confused again - JKT 17:57:02 02/13/19 (3)
- Not Quite - Triode_Kingdom 19:24:29 02/13/19 (1)
- RE: Not Quite - JKT 19:53:45 02/13/19 (0)
- RE: confused again - vinnie2 17:58:34 02/13/19 (0)
- RE: confused again - Caucasian Blackplate 09:12:37 02/13/19 (16)
- RE: confused again - vinnie2 15:23:36 02/13/19 (1)
- RE: confused again - JKT 09:54:58 02/15/19 (0)
- RE: confused again - vinnie2 13:29:54 02/13/19 (13)
- RE: confused again - Caucasian Blackplate 15:17:18 02/13/19 (12)
- RE: confused again - vinnie2 15:24:44 02/13/19 (11)
- RE: confused again - Caucasian Blackplate 15:25:29 02/13/19 (10)
- RE: confused again - vinnie2 15:36:38 02/13/19 (9)
- RE: confused again - Caucasian Blackplate 15:40:30 02/13/19 (8)
- Boy howdy,that really made a difference! - vinnie2 06:42:37 02/14/19 (6)
- RE: Boy howdy,that really made a difference! - JKT 08:34:21 02/14/19 (5)
- RE: Boy howdy,that really made a difference! - vinnie2 08:53:30 02/14/19 (4)
- RE: Boy howdy,that really made a difference! - Tre' 07:47:40 02/15/19 (3)
- RE: Boy howdy,that really made a difference! - vinnie2 11:57:20 02/15/19 (2)
- RE: Boy howdy,that really made a difference! - Tre' 14:49:11 02/15/19 (1)
- RE: Boy howdy,that really made a difference! - vinnie2 15:07:00 02/15/19 (0)
- RE: confused again - vinnie2 17:54:34 02/13/19 (0)
- Big difference on input sensitivity - DAK 18:44:28 02/12/19 (10)
- RE: Big difference on input sensitivity - Triode_Kingdom 07:55:00 02/13/19 (8)
- The RCA tube manual gives no info on triode mode - DAK 09:48:05 02/13/19 (7)
- Apples and Oranges - Triode_Kingdom 19:09:22 02/13/19 (2)
- RE: Apples and Oranges - Tre' 20:35:41 02/13/19 (1)
- Triode Curves - Triode_Kingdom 21:00:22 02/13/19 (0)
- RE: The RCA tube manual gives no info on triode mode - vinnie2 13:32:14 02/13/19 (0)
- RE: The RCA tube manual gives no info on triode mode - buffy 10:52:55 02/13/19 (2)
- Thanx Buffy, you da man! nt. - DAK 21:57:07 02/13/19 (0)
- RE: The RCA tube manual gives no info on triode mode - vinnie2 14:40:38 02/13/19 (0)
- RE: Big difference on input sensitivity - vinnie2 03:29:51 02/13/19 (0)