So I’ve basically nutted out the schematic for the tube amp and I’ve done all the mechanical stuff so it’s full steam ahead wiring it all up. All the power supply stuff, filaments, grounds and most of the output pentode wiring is point to point and sits under the preamp board. Just a little more to do, well actually the whole other side, opps I forgot, which is all the wiring for the pots… but then the board goes in.
So heres a photo without the board.
and heres one with the preamp board covering it up
Now if I can go through my old stuff and find one more 1 Meg log pot I’ll be able to start on the control stuff.
The first attempt at etching a board failed somewhat as the sharpie ink tends to not like long traces because each time you lift off the pen you get a slight edge that doesn’t cover so I did this one using acrylic screenprinting fabric ink with a small brush then tidied it up with the edge of a knife then set it with the heatgun and it worked well. No eating through at all. I now use a fairly high concentration of hydrogen peroxide to hydrochloric and it eats out a board in under two minutes… Bit dangerous though. Chlorine gas isn’t very tasteful.
experimental musics