And here is the completed front end / driver PCB for one channel. The four potentiometers for the 807 bias adjustment as well as the two 12AT7 and one 12AX7 valve socket are mounted on the underside of the PCB (which will actually be the top side when mounted underneath the chassis.
The four potentiometers are mounted on an aluminium plate affixed to the PCB with four screws and spacers.
Although not shown on the chassis diagram above, the potentiometer shafts, as do the valves, will protrude through holes drilled in the top of the chassis.
Each shaft will be fitted with a pretty turned aluminium knob. The front of the chassis will sport the power switch, some indicator led bezels and the moving coil ammeter and it’s cathode current selection switch.
Cheers,
Glen
The four potentiometers are mounted on an aluminium plate affixed to the PCB with four screws and spacers.
Although not shown on the chassis diagram above, the potentiometer shafts, as do the valves, will protrude through holes drilled in the top of the chassis.
Each shaft will be fitted with a pretty turned aluminium knob. The front of the chassis will sport the power switch, some indicator led bezels and the moving coil ammeter and it’s cathode current selection switch.
Cheers,
Glen
