[ARC5] BC-455 - intermittant LO.

[J Mcvey via ARC5]

These radios have been tinkered with so much over the years that anything is possible:

I had a LO failure due to a mico-shard of metal that got into the LO gang section for plate circuit and shorted it out. This particular gang has b+ for the osc plate on it. I never did see the offending shard, but I was able to blast it out with an air nozzle. 
I had to disconnect the gang to verify the short.
 


     On Tuesday, May 26, 2015 6:03 AM, Sheldon Daitch <SDAITCH at bbg.gov> wrote:
   

 Similarly, I had an old Spotmaster cart machine which would occasionally fail to stop when the cart recued.

It worked most of the time, so until it quit totally, I never opened it up, but when I did, I found a lead on a transistor on the stop cue sense board which had never been soldered.

A spot of solder cured the problem.

73
Sheldon


-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Kenneth G. Gordon
Sent: Monday, May 25, 2015 7:23 PM
To: Leslie Smith
Cc: ARC5 at mailman.qth.net
Subject: Re: [ARC5] BC-455 - intermittant LO.

Les:

Concerning your intermittant LO: during a refurbishment of an R-25/ARC-5, I discovered a "no solder" joint in the coil-box, yet the joint had been painted with a dot of red "inspection" lacquer which all other joints had been.

This was a factory fault. 

Soldering that joint eliminated the intermittant LO problems I had experienced with that receiver.

Do remember that the LO voltage is quite low. Therefore, any such fault could have more effect that it would in a rig with higher voltages.

Ken W7EKB
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