Old Muntz TV for sale Locally to me, Should I pick it up?

[vortalexfan]

Originally Posted by Kevin Kuehn

Apparently something has changed since you measured last with the tubes out. Try measuring again from the top on pins 5 and 6 of the 6AK5, with the tube out, still in reference to ground.

Well the only thing different was that the tubes were installed in the tuner when I took those measurements of Pin 8 of the 6V6 and input and output sides of R13, other than that nothing has changed circuitry wise in this TV.

[Kevin Kuehn]

Originally Posted by vortalexfan

Well the only thing different was that the tubes were installed in the tuner when I took those measurements of Pin 8 of the 6V6 and input and output sides of R13, other than that nothing has changed circuitry wise in this TV.

I don't see a problem with the voltages you just measured, but they don't seem to line up with what you reporting earlier with the un-tubed tuner socket pin voltages being so low.

[vortalexfan]

Originally Posted by Kevin Kuehn

I don't see a problem with the voltages you just measured, but they don't seem to line up with what you reporting earlier with the un-tubed tuner socket pin voltages being so low.

Would possibly using the wrong tube in the tuner cause some issues?

I ask because I have been subbing a 6AK5 in place of a 6AG5 tube in the tuner and I wonder if using a substitute tube rather than the original tube that it calls for in the circuit could be causing my tuner not to work right...

I know the tuners in these early TVs were quite finicky about how they worked.

[Kevin Kuehn]

Originally Posted by vortalexfan

Would possibly using the wrong tube in the tuner cause some issues?

I ask because I have been subbing a 6AK5 in place of a 6AG5 tube in the tuner and I wonder if using a substitute tube rather than the original tube that it calls for in the circuit could be causing my tuner not to work right...

I know the tuners in these early TVs were quite finicky about how they worked.

Sams schematic actually shows a 6AK5 for the RF amp. Double check the voltages again from the top side of the tuner sockets and see if they are still as low as before. Leave the tuner tubes out just like you did before.

[vortalexfan]

Originally Posted by Kevin Kuehn

Sams schematic actually shows a 6AG5 for the RF amp. Double check the voltages again from the top side of the tuner sockets and see if they are still as low as before. Leave the tuner tubes out just like you did before.

Yes I know, but I've been using a 6AK5 because I don't have any 6AG5s currently.

As for testing the tube socket voltages, I'll do that again and see what I get, which pins should I test?

[Kevin Kuehn]

Originally Posted by vortalexfan

Yes I know, but I've been using a 6AK5 because I don't have any 6AG5s currently.

As for testing the tube socket voltages, I'll do that again and see what I get, which pins should I test?

I meant they show a 6AK5. For starters just measure the plate pins, that's where we're looking for B+.

[Kevin Kuehn]

While you're at it try turning thought the channels and see if that changes the voltage. I just looked back at your earlier photo and that tuner has a major rust deposit on top. If mice were peeing on it, it could be there's a real mess down in the contacts.

[vortalexfan]

Originally Posted by Kevin Kuehn

I meant they show a 6AK5. For starters just measure the plate pins, that's where we're looking for B+.

I just checked through my tube stash and I did end up finding a 6AG5 tube that tested good yet on my tube tester.

Also checked the voltages from the top without the tubes in and they were spot on to where they should be, on pins 1 and 2 of the 6J6 socket I was getting around 193 volts DC, and pins 5 and 6 of the 6AG5 socket I was getting around 193 Volts DC as well, which I think will drop down to the readings on the voltage chart when the tube is in the socket.

Also I think I might of figured out what's going on, a couple of the center pins on a couple of the 6AU6 sockets broke off on the bottom of the Chassis, one of them is in Video the IF Circuit the other one is the Sound IF 6AU6 socket.