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Old 07-02-2013, 12:14 PM
DavGoodlin's Avatar
DavGoodlin DavGoodlin is offline
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Thats a nice and easy to understand receiver.
I would look at the band selector switch, L4 and L2 in that order.
Just see if there is continuity through each
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Old 07-02-2013, 12:42 PM
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VintagePC VintagePC is offline
Tube bug got me 05/2010
 
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Quote:
Originally Posted by DavGoodlin View Post
Thats a nice and easy to understand receiver.
I would look at the band selector switch, L4 and L2 in that order.
Just see if there is continuity through each
Aye, will verify tonight and report findings. I noticed yesterday while working on it that the hum got louder as I moved my hand closer to one of the wires... Perhaps a poorly connected ground or something is picking up 60hz and throwing off the oscillator. Thought I cracked it earlier when I had continuity to ground on the antenna side of a trimmer cap but it was that way by design.
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Old 07-02-2013, 02:16 PM
old_coot88 old_coot88 is offline
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Assuming you've cleaned the bandswitch with 'Deoxit' or similar cleaner, look the the rotor wafers carefully while you rotate the switch. Be sure they are secure on the shaft and not slipping.

This condition occurs occasionally in wafer type TV tuners. One rotor can be slipping on the shaft or not turning at all.
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