06-13-2010, 10:05 AM
Did you replace the rest of the capacitors?
I assume this is a printed circuit board and you would have cleaned it up with deoxit or tuner spray, so you you can go over the traces and connections to the tube sockets.
Poke around gently with a non conductive tool (I use a chopstick) and see if you can get it to cut out or back in.
Measure the resistors and replace all that are more than 20% off. They all usually drift high after decades. If I have to unsolder one end of a resistor to measure it out of circuit, I usually replace it anyway.
You also might have a silver mica capacitor that is bad. The dreaded mica disease is notorious for this. These will test OK on a digital meter, but will not pass muster when voltage is applied with an old fashioned condenser tester is used. Getting to them can be a real chore, especially if they are in the IF cans. Again, if I have to spend a half hour getting to them I just replace them.
Well that's a start. Good Luck
I assume this is a printed circuit board and you would have cleaned it up with deoxit or tuner spray, so you you can go over the traces and connections to the tube sockets.
Poke around gently with a non conductive tool (I use a chopstick) and see if you can get it to cut out or back in.
Measure the resistors and replace all that are more than 20% off. They all usually drift high after decades. If I have to unsolder one end of a resistor to measure it out of circuit, I usually replace it anyway.
You also might have a silver mica capacitor that is bad. The dreaded mica disease is notorious for this. These will test OK on a digital meter, but will not pass muster when voltage is applied with an old fashioned condenser tester is used. Getting to them can be a real chore, especially if they are in the IF cans. Again, if I have to spend a half hour getting to them I just replace them.
Well that's a start. Good Luck
