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PJL · 12th Jan 2012, 12:26 am

The picture indicates the heater chain is in the following order UCH42 UBC41 -UM34- UF41 UF41 UL41 UY41.

The heater voltages are obviously wildly wrong but they are never going to be that accurate as there will be some DC component due to the half wave rectification.

A heater cathode short might create a few problems so it might be an idea to disconnect both ends of the heater chain from the mains transformer and do some resistance checks along the heater chain and to chassis.

12th Jan 2012, 12:26 am	#52
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Bush AC34, no sound. The picture indicates the heater chain is in the following order UCH42 UBC41 -UM34- UF41 UF41 UL41 UY41. The heater voltages are obviously wildly wrong but they are never going to be that accurate as there will be some DC component due to the half wave rectification. A heater cathode short might create a few problems so it might be an idea to disconnect both ends of the heater chain from the mains transformer and do some resistance checks along the heater chain and to chassis.