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#16
12-26-2024, 07:13 PM
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Time to tackle the sweep circuits.
 It's a challenge alright! The caps on the PCB weren't so bad, but the point-to-point sections are extraordinarily messy. I keep spotting more caps tucked away behind bigger components.   I ended up needing to remove the power supply choke entirely because a 0.1uF paper cap was tucked behind it and part of the harness. Oh well, it opened up the area a little bit.  Dicey! Outside of the caps, every single carbon comp resistor I've tested is 30-50% out of spec. It tracks, what with the set obviously having been stored in a high moisture environment for a while. I've defaulted to changing them without testing at this point. Interestingly, the dogbone-type resistors are mostly all OK, within 10% or better; I haven't needed to replace any of those. I suspect they are an early type of deposited carbon film that ages better. More soon!
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When you lower your standards, you set a new standard! ISO: Mitsubishi 6CT-338, Sony Chromatron 19C70/100, Yaou "Colornetron" GTC-9, etc... 
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