[Hallicrafters] SX-42 transformer problem - help!

[Edward B Richards]

Julian;

Check the band switch for arcing, especially around the third wafer from
the back. A known weakness .  Good luck.

73, Ed Richards K6UUZ
Simi Valley, Ca 93065
Home of the Air Force 1 pavilion

On Mon, 15 May 2006 19:04:04 -0700 Julian Bunn <Julian.Bunn at caltech.edu>
writes:
> A strange problem has developed in my SX-42, which was working fine 
> last 
> night.
> 
> When I turn the set on, I can hear bad fizzing/gurgling noises from 
> the 
> mains transformer, so I turn it off
> quickly! There is no smoke, just this fizzing noise.
> 
> I've removed the 5U4G tube and the octal shorting plug to narrow 
> down 
> what's going on, but I'm
> not getting very far.
> 
> When the set is on, I measure the voltages to be 420 VAC between 
> transformer pins 2 and 6,
> 6.2 VAC between pins 7 and 9, and 4.9V between pins 8 and 10. This 
> is 
> with no 5U4G present,
> and no power to the other tube heaters and dial lamps.
> 
> I'd be most grateful for suggestions of what to look at next ... I 
> desperately don't want to fry
> the mains transformer! Why might it have developed a problem 
> overnight?!
> 
> Thanks,
> Julian
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