I still haven't looked closely to see what the wiper and track is and where it is on the schematic. That said, my capacitor suggestion wasn't worded that way. I suggest that the capacitor is wired such that one end is to the wiper arm and the other end is to the track that the wiper arm is supposed to contact. The capacitor is shorted out if everything is normal. Does your wording mean that too? Any photos of the track and wiper?
John K Australia ----- Original Message ----- From: bob harper To: [email protected] Sent: Friday, March 28, 2014 8:27 PM Subject: [neonixie-l] Re: trigger tube equivilents hhih 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 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. -- 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/BE3D227BCDED4CA59159814A0419B747%40compunet4f9da9. For more options, visit https://groups.google.com/d/optout.
