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silver mica disease

  1. J

    Fisher 440-T Alignment Questions

    I'm trying to finish the refurb of a Fisher 440-T that I worked over a few decades ago. It had some problems that remained, but I think I have fixed each of them, except for two. Fisher 440-T (transistor) SN: 34xxxB. I have the service manual beginning SN 20001, which seems to be the...
    • jadney
    • Thread
    • if alignment silver mica disease smd
    • Replies: 3
    • Forum: Fisher
  2. T

    IF Tranformer Cap Values

    Current project is a MX110Z, and two IF transformers are definitely suffering silver mica disease. Has anyone compiled a list of IF transformers and their capacitor values? It would be nice to have the caps on hand and do the repair all at once, and not have to wait for parts to arrive after...
  3. Weld Engr

    Fisher 800-B AM Z3 and Z5 IF transformer capacitor values

    Howdy still working on my 800-B and believe I have some capacitor issues (silver mica disease?) in the IF transformers based on reading posts and other searches. I have not verified voltages V5,V6 and V7 yet and do not have good tubes to swap in for testing at the moment. I do not get a heart...
    • Weld Engr
    • Thread
    • am if transformer fisher 800b silver mica disease
    • Replies: 10
    • Forum: Fisher
  4. daylite

    SOLVED: Signal strength meter falls on 500C warmup

    In this case the problem was fixed by replacing the caps in IF transformer Z4 I’m finishing my 500C project and put the chassis back in the original enclosure this week. I find when first switched on and for the next 10 minutes I see signal strength at 4.7-4.8. Then it starts a slow fall and...
    • daylite
    • Thread
    • if transformer signal strength meter silver mica disease
    • Replies: 20
    • Forum: Fisher
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