06-02-2018, 10:28 PM
I had an opportunity to put some more time into this radio today. Returning to the "messed about" tone and volume circuit, I remembered where things were left off and retraced the circuit again. The work to reconfigure it to the paper schematic made sense, and I was able to complete it easily. From there, attention turned to the audio circuit, and all caps and resistors replaced in the output and phase splitter sections.
The old resistors were interesting... of 3 220K composition types tested, 2 were at 250K, and one completely open circuit. Two 1k types were around 4K, as was a 2.7K part. The 10K I removed measured around 14K. Lastly, a 220K had been replaced (leads clipped long and the new part hooked in to them ) with a 470 K.
This poor old set was in quite a state. Getting better all the time.
The old resistors were interesting... of 3 220K composition types tested, 2 were at 250K, and one completely open circuit. Two 1k types were around 4K, as was a 2.7K part. The 10K I removed measured around 14K. Lastly, a 220K had been replaced (leads clipped long and the new part hooked in to them ) with a 470 K.
This poor old set was in quite a state. Getting better all the time.
I don't hold with furniture that talks.
