This is a little unusual - let's jump straight to the obvious, the giant capacitors. The Union Tube and Transistor Tourbender is their take on a MKII Tonebender using readily available silicon PNP transistors with a negative ground power supply.
Basically invert a PNP circuit and then stabilise it with a lot of capacitance. Watch the Grey Bench teardown, note that when looking at the schematic, he forgot to include the input cap on the drawing.
Can it work without the giant caps? Maybe, try it and see what happens. You can always chop down the vero board, as I've left all the power up the top.
Do you need to use the weird resistor values show? No - use whatever you can get hold of that's close. I listed them as that's what is on the Gray Bench schematic.
UNION TUBE & TRANSISTOR TOURBENDER - VERO LAYOUT
TEARDOWN VIDEO BY GRAY BENCH
No luck with this one yet, passes signal as a dirty boost but not getting much of a fuzz. Did notice the 1uF cap on the right isn’t going to ground like in the schematics I’ve seen? Could’ve missing something else, have you built this one?
ReplyDeleteHello. I’ll check the layout and get back to you. No, I have not built this, as I have been busy with other projects
DeleteI checked the layout again. While the 1u was in the wrong place (layout updated) it wasn’t anywhere that would cause issues as it was in parallel with a 4u7 capacitor.
DeleteThe correct location for it was across the power rails, and with the size of the caps used for the power supply, missing a 1u cap would not be an issue.
Do you have a signal probe and a multimeter to test the circuit?
Yeah, I will give it another once over. I didn’t have some resistor values so had to do some parallel to get in the ballpark. Might be something there. I’ll let you know 😉
Delete