I am bringing back to life 2 each T-4XC's and 2 each AC-4's that have been idle for over 15 yr. Both units are stock. I checked all the electrical and mechanical connections for security. Checked and cleaned the switches. Tested the tubes and reseated them with DeOxit. I checked all resistance measurements with the Resistance Chart. I connected a Dummy Load. Over a period of 3 days I slowly brought up the combinations with a Variac. At 100 vac the high voltages are +650 and +250 vdc. I adjusted the Bias to .07 amps. Using the Tune-up procedures, I go to Tune, rotate the gain control, and I get no meter movement on either T-4XC. Question: Do I have to connect a R4C to the T-4XC to get output. Right now it's just the T-4XC operating. Best Regards to the Group. Doug
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