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 WTB: Hallicrafters SX-99 2nd IF transformer

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steve_b



Posts : 5
Join date : 2010-10-16

PostSubject: WTB: Hallicrafters SX-99 2nd IF transformer   Sat Oct 16, 2010 8:44 pm

I should know to run through the electronics first, I have this thing totally restored (was a barn find and in HORRIBLE shape), re-capped, re-resistored, and now find that T2 is shorted on the input side, I looked to rewind it, but it's a nightmare of 40g wire...

Anyone have a parted SX-99 around ?


Can numbers are j-19-8-03 and 050-000657

service lit sez part number is 50C656

please help on this beast....way too much work on it to just put it on the shelf dead


Thank much

Steve
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N7RHU



Posts : 3
Join date : 2010-10-12

PostSubject: Re: WTB: Hallicrafters SX-99 2nd IF transformer   Sat Oct 16, 2010 11:15 pm

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Dave Doughty



Posts : 26
Join date : 2010-10-13

PostSubject: Re: WTB: Hallicrafters SX-99 2nd IF transformer   Sun Oct 17, 2010 5:16 am

T2 in the SX-99 isn't anything special. It is a common 455 kHz slug-tuned IF transformer that you might find in any AA-5 table radio that uses them. Is it the coil that is shorted or one of the mica caps built into the plastic base? Silver-mica migration disease is very common in the SX-99.

On the other hand, T1 has taps that are involved in the crystal filter and switched selectivity circuits so finding one of them would be more difficult.

Dave
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burnt fingers



Posts : 70
Join date : 2010-10-12
Location : New Hampshire

PostSubject: Re: WTB: Hallicrafters SX-99 2nd IF transformer   Sun Oct 17, 2010 6:14 am

Shorted to where?

As Dave said, SMD is common if you are reading zero Ohms across the winding and easily repairable.

Carl
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steve_b



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Join date : 2010-10-16

PostSubject: Follow up: SX-99 2nd IF   Sun Oct 17, 2010 6:48 am

transformer is shorted internally to itself....input side is 0.1 ohm when disconnected from cap

it's the winding itself, has heat discoloration badly, not the cap, would be easy to tag a cap across the pins if it was just the cap...even with a trimmer if needed to find value....


Thanks for the link Chuck...I'll order one now Smile



Last edited by steve_b on Sun Oct 17, 2010 6:56 am; edited 1 time in total
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steve_b



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PostSubject: Follow up: SX-99 2nd IF   Sun Oct 17, 2010 6:49 am

just for my notes and thoughts....anyone know the value of the caps in the base?

guess it would be easier to ask than to try to measure one...


Thank again much guys

Steve
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burnt fingers



Posts : 70
Join date : 2010-10-12
Location : New Hampshire

PostSubject: Re: WTB: Hallicrafters SX-99 2nd IF transformer   Sun Oct 17, 2010 1:29 pm

Generally they are 100-120pf for 455 but Ive seen others as low as 80. As long as they are well within the slug adjustment range its not that critical. More L will result in slightly wider bandwidth and the reverse with higher C.

Carl
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