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Intercarrier Buzz
Here's what my Ryder's manual for this set has to say about sound alignment:
"1. Tune in a tone modulated TV signal and adjust the step attenuator until the signal is reduced to a level where "hiss" is heard with the sound.
2. Adjust the sound take-off coil L19 ( top and bottom slugs ), intercarrier coil L22, quadrature coil L2 and buzz control R39 for the cleanest sound and minimum buzz. It must be remembered that any of these adjustments may cause the "hiss" to disappear and fruther reduction of the signal will be necessary so that the "hiss" does not disappear during alignment.
If intercarrier buzz is in evidence, after all normal sound adjustments have been made, the cause may be attributed to one or more of the following:
1. Improper adjustment of the AGC delay control.
2. Defective 6AU6 sound limiter
3. Extremely high signal levels which require attenuation of the antenna circuit.
4. Transmitter over modulation."
I think I should locate these adjustments and have a look at it. The most believable fault here to me would be the 6AU6. I just cant imagine that these adjustments were ever in need of changing from the factory, so I get the impression there is a component failure that's pushed this out of alignment.
The contrast issues are another story...
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