Picked up an early Sr# TR7. It's fine except for a high pitched noise in the audio. It's continuous and not affected by volume control. Not on transmit signal. It's not loud, but noticeable and annoying in headphones. Sounds like one of the oscillators is getting into the audio circuit. Any decoupling mods or improvements related to this? Sr no. Is in the 600 range. Wonder if this is something Drake eventually improved on. Or do I have a problem? Thanks.
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