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hi martin, yes i am watching the GR43 on ebay! yes the 1st tube on the left i was referring to is marked ER32 [sorry thought schematic was posted up] it now has a GR44 installed in place [i have tried a couple] the fault has now been traced to the fact that the cathode connection to the solenoid is via a phenolic track on a pcb with a motor driven wiper arm carrying the connection this if momentarily loses continuity[the track is 50 years old] is enough to fire the GR44 and the solenoid...a capacitor has been suggested across the solenoid, which i have yet to try...bob On Friday, March 28, 2014 9:37:07 AM UTC, Dekatron42 wrote: > > Hi Bob, > > There is a GR43 for sale on Ebay UK here: > http://www.ebay.co.uk/itm/GR43-VALVE-SUB-MINIATURE-GAS-TRIGGER-TUBE-CERBERUS-NEW-OLD-STOCK-/251484552167?pt=UK_Sound_Vision_Valves_Vacuum_Tubes&hash=item3a8da5bbe7, > maybe that seller has more if you need. > > I am sorry but I don't understand which of the trigger tubes you mean by > the "1st tube on the left" - what number is written close to the trigger > tube? > > /Martin > > On Thursday, 27 March 2014 09:04:33 UTC+1, bob harper wrote: >> >> hi all...well i have finally got this thing working...all trigger tubes, >> in the selection system the countdown tubes in the credit unit and the 3 >> digital display nixie tubes...but ONE remaining problem. the 1st tube on >> the left in the schematic a GR44 [i have tried another as well] fires when >> it should, but also when it should not, i disconnected the trigger and it >> still fires...the problem [i think] is that the K cathode is connected via >> a wiper contact on a rotating arm to the reset solenoid, which although >> cleaned and adjusted and tested with the meter, must be occasionally losing >> its contact [bear in mind the etched track is 50 years old] for a split >> second...which i am assuming [here my knowledge gets hazy] that would allow >> the anode voltage to rise and trigger the tube? if this is the case, is >> there a solution to this? if not, my thought was to put in a relay which >> when the motor driving the rotating arm is running it opens the circuit >> from the cathode to the reset coil...any thoughts anyone? thanks, bob >> >> >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/df719e46-8a20-4577-b285-9d0720b19a57%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
