[Boatanchors] Heathkit SB-200 Question - Seeking advice

[Greg Mijal]

Adhesive of choice is chimmey repair adhesive from the home improvement 
store.
73's
Greg
WA7LYO
Kinston NC
----- Original Message ----- 
From: "AI2Q" <ai2q at roadrunner.com>
To: <whitebear1122 at comcast.net>; <boatanchors at mailman.qth.net>
Cc: <heathkit at mailman.qth.net>
Sent: Friday, April 08, 2011 10:18 PM
Subject: Re: [Boatanchors] Heathkit SB-200 Question - Seeking advice


> 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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