[NJARC] Eccles-Jordan flip flop

[Jim Whartenby]

AlexA couple of (more!) comments:I really don't think it is a big deal, perhaps 90% of Spectrum readers will say "cool" or whatever the current approval phrase that is in vogue and then move on.  Another 9% will have some doubt but again move on.  Then there is the 1% of skeptics (aka cranky old men) who have alarm bells ringing as they read the article, research the circuit, try to understand what is going on and then bother to write in about it.
I tried to Google the bio of Richard Brewster and found nothing definitive.  The only bio that I though was relevant was about a mathematician at Thomson Rivers University in Canada.  There is also "Richard Brewster's Experimental Sounds, Experimental Electronic Music" but there is no biographical data there either.  One gets the impression that everyone wants to be anonymous.  In any case, it appears that Richard's experiences are outside of the vacuum tube technology realm.  
Perhaps the telegraph relays could work if the spring tension was reduced so that the weak magnetic field would still pull the armature in.  Other missteps in the circuit are the two 10k resistors on the B+ side of the relay.  They serve no purpose that I can see other then to further reduce the feeble 01A plate current.  Then the cross connected 115k resistors should be moved to the other side of the relay to the junction of the relay and tube plate.
Of course the -63 volts and + 9 volts and/or the resistors in the grid bias circuit would need to be adjusted so that the 01A plate current either saturates or is cut off.  If standard 5% value resistors don't cut it, something is wrong.Regards,Jim


      From: Alex Magoun <a.b.magoun at ieee.org>
 To: njarc at mailman.qth.net 
 Sent: Tuesday, June 5, 2018 10:36 AM
 Subject: Re: [NJARC] Eccles-Jordan flip flop
   
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_________________________________________________________
Jim,

I forwarded your anonymous comments to the editor, who appreciated
them as explaining the challenges of making the circuit work as
Richard described it: "he has gotten it working, just in a way that's
out of spec, which accounts for all the adjusting he had to do. I
think anyone actually trying to reproduce this circuit with 6J5s would
have better luck as indicated." He was going to check with Richard on
that approach and review the schematic, which is now, for better or
worse, in print.

Alex
~~~
Alexander B. Magoun, Ph.D., Outreach Historian
IEEE History Center
Samuel C. Williams Library 3rd Floor
Stevens Institute of Technology
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Hoboken NJ 07030-5991
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+1 732-981-3414
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