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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/49d0ee24-284e-40c3-b991-a8d1a7db8adf%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
