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SuperHert · 5th Sep 2010, 1:20 pm

I have a radio with a UCH81, the valve has gone white. But not the getter flash, the actual glass has changed colour (see attached picture, it's not definitely not the light). The tube is still mostly transparent but you can clearly see the glass has changed colour. The radio this was fitted to has a problem were it can receive no signal yet it has a phonograph input which works fine (bar some hum). I have ordered a replacement valve but I don't want to ruin that one. I have tested all the transformers on the radio and there are no faults. Other than capacitors and this valve, I can't see anything wrong. Basically is this a fault with valve? Was it caused by the radio? I don't remember the valve being this colour when I bought the set last month. The heater still works but without a valve tester I have no idea what condition it is in.

Thanks, David.

5th Sep 2010, 1:20 pm	#1
SuperHert Retired Dormant Member Join Date: Sep 2010 Location: Preston, UK Posts: 2	UCH81 failed? I have a radio with a UCH81, the valve has gone white. But not the getter flash, the actual glass has changed colour (see attached picture, it's not definitely not the light). The tube is still mostly transparent but you can clearly see the glass has changed colour. The radio this was fitted to has a problem were it can receive no signal yet it has a phonograph input which works fine (bar some hum). I have ordered a replacement valve but I don't want to ruin that one. I have tested all the transformers on the radio and there are no faults. Other than capacitors and this valve, I can't see anything wrong. Basically is this a fault with valve? Was it caused by the radio? I don't remember the valve being this colour when I bought the set last month. The heater still works but without a valve tester I have no idea what condition it is in. Thanks, David. Attached Thumbnails