Hi George,
It simple to do, i did several times when i had this amplifier. First of all you need matched tubes (Matched Octet tubes).
Switch Off the amplifier and unplug the 110V
Then remove the tubes cage and place the trimer in Med position
Then place the amplifier to be lying on one side
Remove the top back cover to access to the circuit board
100 Ohms resistor are located near the Power and output transformer, they are 2 W and are in black color (you should be able to find pins near this resistor for TP1, TP2, TP3 and TP4
So use Alligator clip between 2 resistors and place the DVM on Continuous Voltage, for measuring at least 200mV
Then Plug the 110V and Switch on the Amp
The DVM should start to display voltage for 10 - 20 mV at the beginning and increase at least for 30min then it should be stable (during this phase if the 65-70 mv is reached turn a the trimer a little bit to read lower than 65mv
So when it is stable, adjust the value to 65mv
Verify the other resistor they should between 5mv in general if your tubes are matched
If you provide me a email address, i should be able to send you some pictures, i did some when i used to run the procedure
I hope this helps
Laurent
It simple to do, i did several times when i had this amplifier. First of all you need matched tubes (Matched Octet tubes).
Switch Off the amplifier and unplug the 110V
Then remove the tubes cage and place the trimer in Med position
Then place the amplifier to be lying on one side
Remove the top back cover to access to the circuit board
100 Ohms resistor are located near the Power and output transformer, they are 2 W and are in black color (you should be able to find pins near this resistor for TP1, TP2, TP3 and TP4
So use Alligator clip between 2 resistors and place the DVM on Continuous Voltage, for measuring at least 200mV
Then Plug the 110V and Switch on the Amp
The DVM should start to display voltage for 10 - 20 mV at the beginning and increase at least for 30min then it should be stable (during this phase if the 65-70 mv is reached turn a the trimer a little bit to read lower than 65mv
So when it is stable, adjust the value to 65mv
Verify the other resistor they should between 5mv in general if your tubes are matched
If you provide me a email address, i should be able to send you some pictures, i did some when i used to run the procedure
I hope this helps
Laurent