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This Post Has Been Edited by the Author
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 12at7 driver as I do not have a 6n1p and it appeared from the text that either would work.
2. I saw no value for the cap between the two 30k resistors so I used a 47uf/450v I had on hand. Any guesses on what it should be?
3. I used a 12 volt battery for the filament voltage on the 12at7.
4. 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.Before I tear it down and try again I wanted to check and see if anyone sees any problems with the circuit as drawn.
PS I found a post on line that said the shared cathode capacitor for the 6bq5's should be 200 ohms instead of the 400 shown on the schem, so I changed to that.
Edits: 06/21/17 06/21/17 06/21/17 06/21/17 06/21/17Follow Ups:
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