[Hallicrafters] SX-16 partially died on me...

[DJ]

Hi,


Ok, found the problem. 

While poking around and checking things, the main dial string was frayed and broke when I tugged on it, so I restrung it. I then turned my attention to the dial pointer and decided I should probably restring that too.

I had rebuilt the pointer assembly a few years back (and forgot I did that, then I remembered!) and never really used the rig, just rebuilt it and shelved it. Apparently the bandswitch became mis-aligned in relation to the dial pointer during the rebuild, it was off by 2 or 3-bands! Back in business. Thanks to all that replied.

Best Regards,

Douglas - 4Z5TO

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>________________________________
> From: Richard Knoppow
>To:  hallicrafters at mailman.qth.net 
>Sent: Sunday, December 2, 2012 11:35 PM
>Subject: Re: [Hallicrafters] SX-16 partially died on me...
> 
>
>----- Original Message ----- 
>To: <hallicrafters at mailman.qth.net>
>Sent: Sunday, December 02, 2012 11:49 AM
>Subject: [Hallicrafters] SX-16 partially died on me...
>
>
>> Hi,
>> 
>> 
>> I have an SX-16 (first generation). I recapped it about 8 years ago and re-aligned it, pretty much did the full service on it - even put in tubes that all tested very good. It was quite a hot little performer when I got done.
>> 
>> Now I went to turn it on after about a 3 year hiatus, and bands 1,2 & 3 are deaf and 4 has a little reception on it. Bands 5 & 6 are coming in great, but they might be slightly desensitised too, but I can't tell now.
>> 
>> I went through and gave everything a "good" cleaning just to make sure. Didn't "see" anything out of the ordinary.
>> 
>> What should I look for or maybe where should I start. I'm at a loss.
>> 
>> Best Regards,
>> Douglas
>> 
>
>  Its certainly a bit of a puzzle.  This is a fairly simple receiver and nearly everything is common to all the bands. One thing I would suggest is, if possible, listen to the local oscillator on another receiver.  Its possible its not oscillating on some of the bands or is oscillating weakly. Possible causes are a failure of C-21 or C-22, the two coupling caps for the LO. Also check R-7.  It may be useful to check the socket voltages of the LO, mixer, and RF stages to see what is changing there. I think its still possible something has happened to the band switch, worth at least a very close inspection.
>
>
>--
>Richard Knoppow
>Los Angeles
>WB6KBL
>