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
On Sunday, June 16, 2013 12:24:24 PM UTC+1, bob harper wrote: > > doing research on this jukebox pcb....a couple of questions please..the > GR43's the equivalent has been suggested as Z700U by jan wuesten [german > supplier i get obsolete stuff from] but looking at the specs for both > on[franks electron tube page] there appears to me to differences in the > specs....i am not experienced enough in these devises to know if they will > work! > next the ER32 and EA33....the ER33 has actually a GR44 installed in its > place [looks original] this a twin start 5 wire device, the specs on franks > page...but the ER32 which has been desoldered and removed, i cannot find > any info on...its another 5 wire device. > the other tubes i have found o.k and can get replacements, any > advice/suggestions on the above gratefully received! 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/44e416e0-5e2b-419d-8b15-98d62c736f01%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
