03-28-2015, 08:33 PM
Ok the bias divider is the 2 resistors that are connected to center tap of the high voltage winding of the power transformer. The resistors are connected though a choke, it's drawn as a choke but it maybe the FC field coil part of the speaker. Looks like one is 350 ohms and the other is 50.
Try touching pin 5 of the 6F6 should get hum. Try touching the grid cap on the 6Q7 and wiggle the tube at the same time to see of you have a bad connection. Check the resistance from pin8 of 6Q7 to the chassis. Should have 0 ohms. Pull off the grid cap and touch grid cap of the tube without the lead attached. Should hum.
Terry
Try touching pin 5 of the 6F6 should get hum. Try touching the grid cap on the 6Q7 and wiggle the tube at the same time to see of you have a bad connection. Check the resistance from pin8 of 6Q7 to the chassis. Should have 0 ohms. Pull off the grid cap and touch grid cap of the tube without the lead attached. Should hum.
Terry
