"So its obviously time to remove the circuit board.
But wait, the side board is soldered in from the backside
and no way to unsolder it without brute force.
I was puzzled by the side board, which seems to be completely unnecessary. Who uses a side board simply to attach RCAs input to PCB?
1) Does this 'side board' serve any purpose some wire would not ? Would seem straightforward to dispense with without undue force or hassle--toss it--and wire the inputs to the board?
2) All the pics I have seen with resistors in place at position R54 --show two 5W stacked resistors at R54, not one resistor in that position. Was this unit maybe an early one, and then a correction was made in later units.
No useful purpose in the sideboard, other than making it almost impossible to remove.
Obviously the ground on the backside did not work, hence the extra set of blue
I had to specially machine a tool with .060 sidewalls to fit into the circuit board to
get to the nuts that hold the tube sockets to the chassis. Without that tool the
circuit board would never survive unsoldering all of the tube socket pins. This tool
is not going to last long with sidewalls that thin.
Notice the 2 big filament electrolytics and the huge holes for screw mount caps.
Yet the caps installed are not screw mount and are just soldered to the side
of the holes.
I've seen many units with 2 filament resistors, some with one, and some with
none. Still don't understand the first high voltage cap in series with the 15 ohm
resistor. Does absolutely nothing except waste parts.
The resistance of the circuit board lands causes a loss of about .4 volts from the
diode bridge ground to the tube ground. So that is heating up too.