Thread: Late 1950s Zenith Deluxe Roayal 500 Radio
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  #13  
Old 08-30-2015, 01:02 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
Posts: 2,645
Prolly 1U4 and 1U5.
If one of 'em pops the filament, then they all go out since they're in series. Then the radio ain't active anymore.



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