[Boatanchors] [Heathkit] Heathkit SB-200 Question -Seekingadvice

[Carl]

PB Blaster and Kroil have been my choices for decades, I get the PB in 
gallon cans and put in spray bottles.

Carl
KM1H


----- Original Message ----- 
From: "Joe Stefanelli" <j.m.stefanelli at comcast.net>
To: <WQ9E at btsnetworks.net>; <whitebear1122 at comcast.net>; 
<boatanchors at mailman.qth.net>
Cc: <heathkit at mailman.qth.net>
Sent: Saturday, April 09, 2011 2:51 PM
Subject: Re: [Heathkit] [Boatanchors] Heathkit SB-200 
Question -Seekingadvice


> Has anyone tried "PB Blaster."  Buy it at your local car parts supplier. 
> It
> is the most amazing rust-dissolver/penetrant.  I was skeptical, but after
> breaking two wrenches and failing with a torch and penetrating oil, I
> sprayed PB Blaster on four rusty bolts on my wife's car and waited 10
> minutes.  All four then screwed right out with minimal effort.  Nothing's
> like it.
>
> I would only caution you to keep the unit positioned so that the liquid
> won't drip into the electronics.  Let capillary action draw it up and 
> around
> the shaft.  Just keep the outside edge of the hole wet and give it time to
> work, or let gravity help, but apply sparingly.  Also, wipe off of paint 
> or
> finish quickly to prevent damage to that.
>
> -Joe
>
> -----Original Message----- 
> From: WQ9E at btsnetworks.net
> Sent: Saturday, April 09, 2011 12:20 PM
> To: whitebear1122 at comcast.net ; boatanchors at mailman.qth.net
> Cc: heathkit at mailman.qth.net
> Subject: Re: [Heathkit] [Boatanchors] Heathkit SB-200 Question -
> Seekingadvice
>
> Scott,
>
> What has worked best for me in freeing stuck shafts is to heat the shaft
> with a fairly large soldering iron and then add light (5W-20) full 
> synthetic
> oil which will get pulled in between the shaft and bushing as it cools. 
> It
> usually takes half a dozen heat/cool cycles but only once has it failed to
> work and that was in a radio that came from long term storage on the floor
> of a damp basement.  Use full synthetic and don't use anything larger than 
> a
> soldering iron or you will cook the oil and make it worse.
>
> Rodger WQ9E
>
> ----------------------------------------
> From: whitebear1122 at comcast.net
> Sent: Friday, April 08, 2011 8:50 PM
> To: boatanchors at mailman.qth.net
> 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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