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Recapping 180 - Printable Version

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Recapping 180 - OzRadio - 11-10-2006

I've recapped my 40-180 except for about four that are wedged underneath all the mechanics for the push button tuning. The guy's who been helping with the electronics said he wouldn't mess with them; all the rest are replaced. What do you all think? Should I go ahead and attempt to remove the push-button section to get at them?
Ryan

- Chuck Schwark - 11-10-2006

The caps, 20, 22, 23, 24 are all mica caps and probably are ok. Although, micas have been know to go bad now and then.

If there is any problem aligning or tacking or setting pushbuttons, then they should be replace with newer silver-micas types.

Resistor 25 (33K in the pushbutton gang area) should also be checked for out of 20% tolerance and repalced if it's out of spec, just like all the other resistors in the set for proper performance and restoration longevity.

- OzRadio - 11-10-2006

No, these are wax (3 x .05 and 1 x .01). I can hardly squeeze my fingers down there to move them just a bit.
Ryan

- Chuck Schwark - 11-10-2006

Then, unfortunately, they have to go, if I were you. You'll regret it in the long run as you run the set over time. If one of those caps is the AVC filter (#32 maybe?), it will eventually cause AVC (read RF/IF gain) problems and reception can overload due to excessive leakage to ground or open up and cause distortion due to unfiltered audio signal modulating the front-end gain at audio frequencies or motor-boating. If they are B+ or screen bypass caps, the set can start squealing.

See if the replacement caps can be shifted to the same point electrically, but in a new/better physical location.

- OzRadio - 11-10-2006

Okay, thanks Chuck. That was my gut feeling but I thought I'd get a second, more qualified, opinion. Should be an adventure.
Ryan