OK, has anyone else had a go at building a 12au7 version?
I've built the version without the rate LED, and I'm not getting a lot happening. The Valvecaster 'donor' was a working ptp 12au7; the gain and volume pots were moved and replaced with 100K resistors; the tone pot and cap was removed. It was retested again prior to the Vibe graft.
The additional circuit has been wired up on a bit of perf according to the v2 au7 schematic earlier it the thread.
I have powered it with regulated 15v, 12v and 9v. I have tried BC547, 2n5088 and 5089, and 2n3904 in the circuit.
When switched in, there is no effect, just the clean and much-loved valvecaster tone.
Interestingly enough, despite swapping the pots over 3 times for new and checked pots, there is a rumble when the depth pot is moved.
I have removed the 4148, and while I understand that was there for the LED, there is no evidence of any LFO ticking.
I'm pulling power off pin 5 and ground to pin 4. I am getting good voltage at the board. I have split the power off to its own supply with no change.
Here is my rough perf layout.
Any thoughts? Anything obvious?
DD.