Curiosity got to me so I pulled the chassis out and measured the capacitors around the 3rd IF that my earlier in-circuit testing showed way high/low. See below, what does everyone think, would tighter tolerance capacitors improve the response? C19 looks the most critical and is spot on.
- C18 - .001uf 10% 1kv ceramic capacitor, measures out of circuit 1090pf which is 9% high
- C19 - 100pf 10% 500v N750 temp code ceramic capacitor and measures out of circuit 99.54pf
- C20 - .0015uf 10% 500v ceramic capacitor but measures out of circuit 1194pf which is 20% low (Zenith # 22-12)
- C21 - .001uf 10% 1kv ceramic capacitor but measures out of circuit 785pf which is 22% low (Zenith #22-17)
If I do look to replace C20 & C21 they look to be a generic temp code, searching for the SAMS replacements part numbers returns a temps code of X5F
12-17-2023, 02:14 PM
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