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What is the model number? Hitachi service data that I have is by model, not chassis. Should be a CTXXXX model number. Hitachi sets of that vintage had a pretty good AGC action, and it may be as simple as backing off of the AGC control. Too early of a set to have a jungle chip, so it's likely an easy fix for the buzz.
Lemme know the model and I'll see if I have a copy of the service data, archived by Hitachi in TIFF format.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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