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Old 16th Jan 2021, 6:26 pm   #4
MotorBikeLes
Octode
 
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 1,747
Default Re: Telequipment D67 Fault

OK, you can check grid cathode voltage relationships, but you must realise these are at high voltage. You could measure from G1 to chassis, and similarly between cathode and chassis, turning brilliance up and down to see the brightness action. (Look at circuit and read manual). Do not do it unless you have a SAFE test meter. If you put meter between grid and cathode, the range is probably 30v to 90v negative grid wrt cathode, 30v being bright, 90v being very dark.
Regarding the TR261/2, switch off scope, unplug each transistor and check out of circuit. - I am pretty certain these are all in sockets.
Les.
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