01-15-2015, 12:18 PM
Yes. Change resistor (10), 15000 ohms which is in parallel with mica cap (11), 700 pF, to 8200 or 7500 ohms.
If that doesn't work, replace the 36 tube with a known good one.
It was found during production that 15K was too high a value to allow for reliable oscillation, so the factory recommended changing to 10K. As many of us have been restoring these sets, we have found that a change to 8.2K or even 7.5K is necessary to make the oscillator run reliably.
The autodyne circuit employed in the 89 and 19 is known to be flawed, but when it does work, it is usually OK.
If that doesn't work, replace the 36 tube with a known good one.
It was found during production that 15K was too high a value to allow for reliable oscillation, so the factory recommended changing to 10K. As many of us have been restoring these sets, we have found that a change to 8.2K or even 7.5K is necessary to make the oscillator run reliably.
The autodyne circuit employed in the 89 and 19 is known to be flawed, but when it does work, it is usually OK.
--
Ron Ramirez
Ferdinand IN
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