05-03-2010, 07:50 PM
Your 84 should play rather well for the kind of radio it is. It will have some audio distortion due to its cheap design, but it should have little if any hum.
Please double-check to make sure the negatives of the filter capacitors are connected to the center tap of the power transformer's high voltage secondary, as Terry has suggested. The 77 2nd detector tube or the 42 output tube could have a heater to cathode short, or leakage? This will cause problems.
Check all of your resistors. I've find that of the 80, 81 and 84 sets I have serviced over the years, that the resistors have almost always changed in value from their original ratings. If they deviate more than 20% from published specifications, they need to be changed.
Please double-check to make sure the negatives of the filter capacitors are connected to the center tap of the power transformer's high voltage secondary, as Terry has suggested. The 77 2nd detector tube or the 42 output tube could have a heater to cathode short, or leakage? This will cause problems.
Check all of your resistors. I've find that of the 80, 81 and 84 sets I have serviced over the years, that the resistors have almost always changed in value from their original ratings. If they deviate more than 20% from published specifications, they need to be changed.
--
Ron Ramirez
Ferdinand IN
