[Hallicrafters] SX-42 Hum(bug)

[poularas at ozemail.com.au]

Hello all,
After two SX-42 restorations and one a total rebuild the resistors in the IF section and around the band switch are a must for a upgrade..
I have two working SX-42's and my mate has one as well.
We found that the low value resistors were all way out of spec on all of the SX-42's seen to date..
Replacement of these made a great difference to the sensitivity of the receiver with the greatest change to the upper bands..
To get to some of these removal of the side panel of the radio was the best way to get at the band switch..
It only requires a few screws and you can work on the area with relative ease..
All the best with the SX-42 a great band curser..
Regards
Ray 
www.tuberadio.com



> 
> From: Barry Hauser <barry_hauser at juno.com>
> Subject: Re: [Hallicrafters] SX-42 Hum(bug)
> Date: 30/07/2002 9:39:16
> To: mikesmout at sympatico.ca
> CC: hallicrafters at mailman.qth.net
> 
> Hi Mike:
> 
> Good luck with your SX-42 venture.
> 
> Just in case you haven't seen it yet, there's an excellent piece on an
> SX-42 restoration on Phil's Old Radios site.  Lot's of photos and
> hard-won experience, plus an interchange between Phil Nelson and A. B.
> Bonds.
> 
> The URL is http://antiqueradio.org/halli07.htm
> 
> BTW - has anyone heard from A. B. Bonds lately?  I hesitate to ask, as he
> used to be fairly active on several of the reflectors.
> 
> Barry
> 
> 
> On Mon, 29 Jul 2002 06:53:03 -0700 "Mike Smout" <mikesmout at sympatico.ca>
> writes:
> > I've completed the first part of the SX-42 restoration which is the 
> > cosmetic part. After sliding the chassis back into the cabinet I 
> > built up the nerve to power it up. I know what you're thinking, but 
> > I do not own a Variac and the temptation was great. Everything lit 
> > up, no smoke, no flames etc. All I got was a hum. My first thoughts 
> > are that the electrolytics are shot, so I purchased an entire set of 
> > caps *yikes what a job this is gonna be* and will proceed to replace 
> > them, at least the ones that I can get at. The chassis is super 
> > clean and it appears that there is no leakage from the paper caps. 
> > Also, it appears that no one has done any modifications to it at any 
> > point in its life. I have tested some of the tubes and a couple are 
> > testing border line. Assuming that the electrolytics gave up the 
> > ghost, could this have damaged some of the tubes if it were left on 
> > for a period of time. I would welcome your suggestions on what to, 
> > and what not, to do. Thank you in advance. I also looked at the 
> > bandswitch mechanism and switched it with the power on to look for 
> > any of the famous "shorting out" and it doesn't do this. Thanks, 
> > Mike Smout
> > 
> > 
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