[RTTY] Mainline TTL Tube FSK Demod

[N4BE_Jim]

I acquired a homebrew tube FSK demodulator from an eBay estate sale.  Probably a silent key.  The seller was in Crawford, Ga. 
 
The photos are at http://s685.photobucket.com/user/N4BE/library/Mainline%20TT-L%20FSK%20Demodulator
 
The demod works perfectly as far as I can tell.  The photos don’t do it justice, it was planned and constructed in professional manner by whoever did it.
 
This is actually a demodulator based on the design in Oct. 1965 QST Magazine.  There is a brief description at http://www.rtty.com/development/tu/ttl-fsk/ttl-fsk.htm
 
My question is does anyone know who the ham might have been who built this?  I asked the estate seller but got no response.  I actually built one of these in 1967 when I was a kid, but mine was no where as well built and compact as this.  Brings back a lot of memories.
 
Jim N4BE
n4be_jim at yahoo.com

Sent from my iPad