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Not really ... its square 5001.
Try these: Feed (as usual through a .01 or .001 uF cap) the external tuner to
pin 2 of V2. Does it work?
Remove V1 and repeat ... is there any difference?
Try connecting the input through the usual cap to the pin 7 on the v1 socket ...
does it work?
Connect the input to pin 2of v1. Check the voltage to ground at the cap lead.
(With tube out). Insert v1. Does the voltage change at all? Does it work?
Wiggle v1 vigorously ... does anything change. Try a different 6EH7 ... does anything change, with wiggling.
If its close quarters, attach a thin bent wire to the probe tip to reach the pins.
Disconnect the wire to pin 2 of L3, everything else the same. Does it work? Is the voltage at pin 2 of v1 the same? Check voltages at each and every terminal of
L1, L2, and L3 ... all should be the same. This takes a high impedance voltmeter.
IF there is any picture at all ... does it change differently as you touch different terminals.
Finally ... have you checked that each and every pin of v1 is in fact making
a connection to a wire connected to that pin? By that, I mean actually touching
a probe to the pin itself, with the tube pulled a little out so you can reach the pin ...
and wiggle the tube. Of course, a tube extender is better.
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