debugging time

debugging time

Posted by vinnie2 (A) on June 21, 2017 at 07:30:49

Got a breadboard put together (see link) but I am having trouble getting it to work properly. I am getting sound out the other end, and it sounds ok with low B+, but as I increase the b+ toward what it should be it starts breaking up and distorting.
I had to make a few changes due to not having the parts I needed as follows;

1.I used a 6dj8 driver as I do not have a 6n1p and it appeared from the text that either would work. It sounds better than the 12at7 I first used.

2. For my b+ for the driver I just used a clip lead from the b+ connection to the opt to the 4.3k (I used 3.9k) resistor.

3. I looked in the tube manual and it said for 6bq5 in pp the cathode resistor should be 130 ohms, so I used that instead of 400 ohms.

4 . I used 0.1uf for the two capacitors between the two stages instead of 0.46uf, as per the recommendation in the text of the schematic.

http://www.diyaudio.com/forums/tubes-valves/185823-unexpecte (Open in New Window)

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Topic - debugging time - vinnie2 07:30:49 06/21/17 (20)

final update .... - vinnie2 05:47:18 06/23/17 (2)

RE: final update .... - rage 07:27:03 06/23/17 (1)

RE: final update .... - vinnie2 10:17:23 06/23/17 (0)

Arrrrgggghhhhhhhh! - vinnie2 12:42:20 06/22/17 (0)

RE:subbing the 6n1p with a 12at7? - DAK 11:15:02 06/22/17 (1)

RE:subbing the 6n1p with a 12at7? - vinnie2 12:30:03 06/22/17 (0)

RE: debugging time - 6AS7_6SN7 04:00:28 06/22/17 (0)

pin layouts - RayP 13:40:32 06/21/17 (1)

RE: pin layouts - vinnie2 13:53:34 06/21/17 (0)

Do your voltages somewhat match the schematic? (nt) - Chip647 11:09:52 06/21/17 (7)

RE: Do your voltages somewhat match the schematic? (nt) - vinnie2 13:42:38 06/21/17 (5)

RE: Do your voltages somewhat match the schematic? (nt) - cpotl 06:35:03 06/22/17 (1)

RE: Do your voltages somewhat match the schematic? (nt) - vinnie2 07:17:43 06/22/17 (0)

RE: Do your voltages somewhat match the schematic? (nt) - Chip647 14:14:53 06/21/17 (2)

RE: Do your voltages somewhat match the schematic? (nt) - vinnie2 08:03:58 06/22/17 (0)

RE: Do your voltages somewhat match the schematic? (nt) - vinnie2 17:28:23 06/21/17 (0)

RE: Do your voltages somewhat match the schematic? (nt) - vinnie2 11:18:33 06/21/17 (0)

RE: debugging time - FenderLover 07:51:05 06/21/17 (2)

RE: debugging time - vinnie2 07:56:04 06/21/17 (1)

RE: debugging time - FenderLover 08:07:57 06/21/17 (0)

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