Philco 66 - Sweet Music at Last!!
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Threads: 56
Joined: Nov 2008
City: Sedona, AZ/Placentia/CA
Joe, really need to get the audio amp section working well before chasing signals from the antenna or injection of signals from your generator. Particularly if your working without a scope. If your using the speaker output to do things and the amp is not working properly, well, it's like working in the dark. Tone insertion on the control grid of the output tube and the first audio seem to be the next phase as was indicated earlier. You will be after the volume control so keep the generator audio gain down low. Hate to see you put a large signal in and launch your speaker cone. Needless to say, you also need to confirm the voltages on the two tubes. Something is wrong in the audio if your not getting a hum out while touching the center tap of the volume control with the volume up. Voltage measurements will give you good idea where the problem is. Signal input to the two control grids will also tell you which section. It could be something as simple as the wires going to the speaker are not wired correctly. They are color coded on the schematic. I only suggest that as you indicated in a previous post that they were disconnected.
Good luck and we are watching. The audio section is pretty straight forward.
Jerry
A friend in need is a pest! Bill Slee ca 1970.
Messages In This Thread
RE: Philco 66 - Coil troubles? - by jerryhawthorne - 05-26-2012, 04:15 PM
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