[NJARC] Eccles-Jordan flip flop

[Jim Whartenby]

Hi RobAppears that the 6SN7 is two 6J5s in one envelope so you were right on the money in your selection.  Either tube is capable of passing 20 mA maximum plate current.  Still, using the Morse relay as in the IEEE Spectrum article, I doubt that the circuit would work as shown using either two 01As or two 6J5s or a 6SN7.
I think I have a Morse relay in the collection but it is missing the return spring IIRC.  I could check the pull in current of the relay if I can find a suitable spring but I think that there is enough evidence available on the 'net that the current required is at least twice of that supplied by the 6SN7 and perhaps five times what an 01A could provide.
Seems that your granddad was quite prolific!  Jim

      From: Rob Flory <farmer.rob.flory at gmail.com>
 To: New Antique Radio Club <njarc at mailman.qth.net> 
 Sent: Thursday, May 31, 2018 6:17 AM
 Subject: [NJARC] Eccles-Jordan flip flop
   
There was a a time I was interested in trying to recreate a counter using this circuit as a building block, using 6SN7 dual triodes.  It never made it off the notepad and onto the breadboard.  

I had reasons to think 6SN7 was a good choice, among others taking half the space of using single triode tubes like 6J5.  I also may have seen diagrams or examples of historic bits of computers using them.
Grandpa made what had to be one of the first all-electronic clocks at RCA before WWII.  They were messing around with counters, timers, and multipliers for the military.  

http://patft.uspto.gov/ netacgi/nph-Parser?Sect1=PTO1& Sect2=HITOFF&d=PALL&p=1&u=% 2Fnetahtml%2FPTO%2Fsrchnum. htm&r=1&f=G&l=50&s1=2410156. PN.&OS=PN/2410156&RS=PN/ 2410156
Click the button that says images.  Earlier patents show on USPTO as scans, not OCR like later ones.

RF
Just remember
Reply = Poster
Reply All = Everyone

_________________________________________________________
______________________________________________________________
NJARC mailing list
Home: http://mailman.qth.net/mailman/listinfo/njarc
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:NJARC at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

   

|  | Virus-free. www.avast.com  |

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/mailman/private/njarc/attachments/20180531/af328896/attachment.html>