[Boatanchors] Bc-348 volume control

[Mark Foltarz]

Bob,

  Yes we have all been there.  Quite often it is heat and lubricating oil that 
does the trick.

   I prefer PB Blaster as oenetrating fluid of choice.

   For the heat you can leave the allen wrench in the screw and heat the wrench 
up gently with a torch and let the heat transmit
down ( or up ! ) to the screw.

  Oil and heat repeatedly. Leave it alone for an hour or overnight - repat. You 
may get lucky,

  Only once have I had to saw up a knob to remove it - on a national HRO. 
Otherwise pretty good luck with the above.

de KA4JVY

Mark


 


----- Original Message ----
> From: BOB <hoopmonk at snet.net>
> To: boatanchors <boatanchors at mailman.qth.net>
> Cc: milsurplus <milsurplus at mailman.qth.net>
> Sent: Tue, October 12, 2010 8:19:41 AM
> Subject: [Boatanchors] Bc-348 volume control
> 
> I belive the AVC-MVC pot on my BC-348 has gone south. I tried to remove the 
>knob with an allen wrench but the set screw wont budge. I know from experience 
>that I have pushed the wrench to the limit of where either the wrench will 
>twist, the wrench will strip, or more likely the set screw allen socket will 
>strip out. In that event I probably could drill the set screw out from the 
>bottom of the set but I only want to do that as a last resort. Does anyone have 
>any suggestions? Also I haven't found a replacement pot that has the same values 
>as the orginal ( 20,000 ohms front section 350,000 rear). If anyone has an 
>orginal one in their junk box I would be happy to purchase same.
> 
> Thanks in advance  to any and all response's
> 
> 73
> 
> Bob Weaver W1GTH
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