I have encountered a problem with a recently acquired L-7.(serial # 881) When first turned on, HV is indicated on the multimeter. However, after about 10-15 seconds one of the circuit breakers on the PS-7 trips. The area under the RF deck where the filament transformer is located seems to get warm.
Does this sound like a bad 3-500 tube (filament to grid short) or is there a problem with the filament transformer? I have checked the 3-500's with no voltage (filament or HV) applied and I do not get any abnormal readings. Any suggestions would be appreciated. Tnx & 73 Ed K2ZE
