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Me, I'd stick to the dipped silver micas, with possibly NP0 ceramics as a backup. The silver/clear polystyrenes like to crack and open up. We serviced a lot of Sharp and Hitachi B/W sets back in the 80s that had only one problem - the polystyrene caps in the horizontal oscillator would crack, change value, and we'd replace them with "close in value" silver micas - they had some odd values like 700pf and 850pf in the larger screen sets.
NP0-tempco ceramics don't have a drift factor - so are suitable, stable alternatives to silver mica caps.
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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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