Right, I understand. I have switched off any sleep function in my test clock that has been running 24/7 so the clock won't shut down when the room is unoccupied and I'll come back in a few hours and check. The test clock has the acrylic columns cut at 45 degrees compared to 22.5 degrees in the photo, so more of the back of the E1T is covered.

Back later...

Grahame

On 18/02/2019 13:17, Dekatron42 wrote:
The ones I have that get hot do it closest to the base where the heater wires 
enter the cathode and where they aren’t shielded. It looks like the round 
acrylic tube is very close to the E1T, that’s the part I wondered if it was too 
close.

/Martin


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