70smidfiguy
Active Member
One last test for fun. I put all of the old transistors back in one of the two boards.
Same result as above.
Same result as above.
The pots can and do go bad not saying this is the cause of your problems thoughI also removed the Control Amplifier Assembly (AWG-027) cleaned all connections.
Everything looks pretty good, however when I test pin 15 on the PS I still get about 26.x v vs PIN 11 PS which is -23.x v.
The only tr's on that board are 2 x KSA992 (replaced) and 6 x 2SC1312's.
Could the pots be an issue?
Thanks.
Could you please also confirm the replacement output Tr's parts and their installation order.
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@zebulon1 ^^The screws holding Q9 and Q10 (TO-220) to the board rch heatsink do not appear to have insulators under the screw heads, and the insulators between the tabs and the heatsink are rippled and not laying smooth. Maybe shorted? +55vdc to -55vdc?R13 which is a 1.2K resistor measures at 1.158K.
Pictures of Rch Amp Board enclosed
Thanks, I could see something back there in another view but did not know what it was, didn't see anything in the manual.They don't need the screw insulators. The heatsink has a plastic nut-plate secured to the heatsink.
I did see the poor sil-pad install.