[Boatanchors] Heathkit SB-200 Question - Seeking advice

[AI2Q]

Scott, it sounds like the switch detent point is assembled improperly.

Vy 73, AI2Q, Alex
-ex-Heath service technician

Member: ARRL, FOC, RSGB, CWops, QRP-L, Antique Wireless Association, Wide 
Area Amateur Radio Network
http://home.roadrunner.com/~alexmm

----- Original Message ----- 
From: <whitebear1122 at comcast.net>
To: <boatanchors at mailman.qth.net>
Cc: <heathkit at mailman.qth.net>
Sent: Friday, April 08, 2011 9:49 PM
Subject: [Boatanchors] Heathkit SB-200 Question - Seeking advice


>I just acquired a nice SB-200, looks nearly new. The frequency knob doesn't 
>turn. It doesn't budge. When I couldn't get the knob off I figured I was at 
>the verge of a new adventure in restoration.. I eventually got the knob off 
>but I had to wale on it. Oddly the knob insert stayed on the shaft.. 
>Geez.... I got the insert off with the pliers. Don't know what the deal is 
>with that.
>
> The detent mechanism grease looked minimal and old I though perhaps it was 
> stuck on old grease so I sprayed it with WD-40 and let it set for a while. 
> Still wouldn't move so I removed the whole rotary switch assembly. It was 
> easy enough to remove. I did have to unsolder some of the wires on the 
> outside wafer so it would move out of the way and allow the shaft to back 
> up enough to lift the whole assy out.
>
> I then disassembled the rotary switch assembly and removed the detent and 
> shaft from the wafers. The shaft still doesn't turn. I put the edge of the 
> detent mechanism into the vice and used some pliers to work the shaft back 
> and forth. Nothing. It doesn't turn like it should, but the bushing moved 
> along with the shaft. Geez.... I'm guessing the shaft is corroded into the 
> bushing.
>
> About all I can think of is to saturate it with WD-40 with the bushing 
> facing down, hopefully getting the WD-40 inbetween the bushing and shaft, 
> then put it a baggie to minimize evaporation, and let it sit overnight.
>
> As I think about it, I suppose I could try to heat up the bushing assembly 
> and see if there can be some expansion to pull away from the shaft.
>
> I have never encountered this difficulty before. What a pain. Well, I am 
> able to get further into the amp and clean out the dust.. hi hi
>
> Since I've got you on the line, one of the 572's has a loose cap. What is 
> the glue of choice to secure the cap to the glass envelope?
>
> Any suggestions are appreciated. Thanks. 73, Scott WA9WFA
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