[Boatanchors] BC-348 E-M-P

[jmfranke]

I had a couple TCS receivers with the same problem inside the IF 
transformers and the BFO tank circuit. I made a tool that slid behind the 
shaft of the capacitor. It was a 1/4" square bar with a 4-40 headless screw 
tapped passing through at each end. The screws allowed me to raise the bar 
and push the shaft back into position. Then I pressed the hex sleeve back in 
place and drilled through the hex sleeve and capacitor shaft, threaded the 
hole 2-56, and added a small screw. Everything was done in the receiver with 
only the transformer or BFO coil shield removed.

John  WA4WDL

--------------------------------------------------
From: "Al Klase" <al at ar88.net>
Sent: Thursday, May 12, 2011 10:15 PM
To: <BOATANCHORS at MAILMAN.QTH.NET>
Subject: Re: [Boatanchors] BC-348 E-M-P

> Hi Joe,
>
> Years ago I had a similar problem with APC trimmers in a Navy receiver,
> an RMB or RBS, as I recall.  I was able to make a tool by grinding away
> at a small C-clamp that allowed me to press the rotors back into
> position, and apply solder to fix the hex adjuster nut to the shaft.
> Wish I could provide a drawing, but it was along time ago.  Use your
> imagination.  My recollection is, that on the Navy radio, I was able to
> repair the APC's /in situ/.
>
> Al
>
> On 5/12/2011 8:47 PM, Joe Walden wrote:
>> Hello members of the various reflectors,from Joe w5jdy in Okla.....  I 
>> want
>> to share an experience I am having with a BC-348-P receiver.  This radio 
>> had
>> been setting in a dry temperature controled environment for about 40 
>> years.
>> It was working when it was stored.  Upon reviving the external power 
>> supply
>> and connected it to the radio,it didn't play hardly at all.  Some bands 
>> were
>> partially dead and others were entirely dead.  After trouble shooting I
>> found that about 5 or 6 of the 30 or so alignment APC trimmer caps 
>> located
>> in the Ant,RF,Det and Osc boxes had shorted. They had slipped on the 
>> shaft
>> someway and shorted the plates together.  In all the old parts I have I 
>> will
>> be able to replace most of the bad ones (I hope) but during removal of 
>> one
>> of them the lead broke off of a 50pf mica cap right up next to the case.
>> Too close to repair.  My 2 questions are:   Has anyone else experienced
>> trouble with the trimmer alignment caps in other BC-348?   And can anyone
>> help me with a silver mica 50pf at 400 volts 1%.    Pleas contact me off
>> list atw5jdy at cox.net     Thanks, Joe
>>
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>
> -- 
> Al Klase - N3FRQ
> http://www.skywaves.ar88.net/
>
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