rphancock1
Member
- Joined
- Aug 14, 2018
- Messages
- 17
Hi, still working on this pair of Berlant Concertone preamp conversions. I’d like to do away with the signal selector pot (R 121 on the schematic below, connecting V101 to V104) and use it as an standard output volume control.
My problem is losing the signal path, and where I’d put the pot in that path. I traced it to the best of my abilities (yes with my children’s colored pencils) below, switching from yellow to pink whenever the signal is inverted. I’m not totally clear on what’s happening at V104 though. I assumed a cathode follower feeding the HiZ side of the output transformer, but I’m not clear on how it’s sending a balanced signal.
If someone can clear that up for me and suggest a value and placement of the output gain pot I’d be grateful.
Best
Ryan
My problem is losing the signal path, and where I’d put the pot in that path. I traced it to the best of my abilities (yes with my children’s colored pencils) below, switching from yellow to pink whenever the signal is inverted. I’m not totally clear on what’s happening at V104 though. I assumed a cathode follower feeding the HiZ side of the output transformer, but I’m not clear on how it’s sending a balanced signal.
If someone can clear that up for me and suggest a value and placement of the output gain pot I’d be grateful.
Best
Ryan