Progress has been slow up to this point but all the effort that was put into the design is starting to pay off and the amp is coming together quickly. I have made one minor change to the plan: I was going to put the flying-leads onto the valve sockets to keep the turret-board tidy until it was put into the chassis but I realised that would be rather impractical so the flying leads are now soldered onto the turrets as you can see. It makes the board a little more difficult to work with but it would be very difficult to solder flying-leads onto turrets in the chassis. Much easier this way and I discovered a little dodge to keep the flying-leads out of the way.
I have a ValvePower guitar combo that uses perforated turret board so I had a close look at that and noticed that the flying-leads were pushed through the holes to keep them out of the way of the rest of the circuit. A neat idea that I adopted immediately – you can see the effect in the picture.
I haven’t designed this into the circuit but I need a way to cut the low bass. This requirement has come up a few times in conversations with bass players and it makes sense. In a domestic environment rooms are small and the wavelengths of bass notes are relatively large. At home bass-player will have to reduce the amplitude of low bass to avoid problems. By how much is the big question; more research is required.