The label that shows the tube placements has it as a 8FQ7/8GC7. The voltage on the cathode of V1B is correct and flat on an oscilloscope, though the vertical disappeared after I replaced the the electrolytic can with new electrolytics. Basically I’ve checked a bunch of voltages and resistor values. I’m trying to get my hands on the voltage specs for a 1077B. They are different than the 1077, so until I get the right ones I’m not going to spend any more time on it, unless the OP chimes in with what happened with their unit.
Last edited by judge; 02-22-2020 at 09:06 PM.
|