[Collins] 51j-4 Product detector

[Dr. Gerald N. Johnson]

At: http://antiqueradios.com/forums/viewtopic.php?t=123242 Greg G talks 
about Collins having made a few for a contract and also kept a few in house.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association

On 1/6/2011 4:24 PM, Alan Chandler wrote:
> I just opened a 51J-4 to install the TreeTops product detector and found
> that what appears to be a factory installed product detector.  There is a
> stamped legend "MOD 6BE6" next to the BFO tube V114.  The original BFO tube
> was a 6BA6.  It is wired as a product detector.  Also, the serial number is
> 5001D.  I have not seen a letter in the serial number before.  I know there
> were some published product detector modifications that used a 6BE6 in the
> BFO tube position but not as a factory modification.
>
>
>
> Anyone have additional information?
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>
> 73, Alan - K6RFK
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