[GreenKeys] tube?

[Duncan Brown]

Tim,

Yes, the tube is a 25L6GT, designed to work with military 24-28VDC supplies.

The first time I put power to our TT-30 (military, 26VDC, version of the 
M31), the motor ran fine, but then it started to slow down. Thinking 
something was binding or there was a bad bearing, I shut the power off 
quickly.  After checking for anything overheating, I tried it again and 
got the same result: motor slowed down after a few seconds, but then 
maintained the new speed.  Then I realized that the filament had to warm 
up before it would start regulating!

Duncan,
K2OEQ

On 06-Jan-13 16:57, Jim Haynes wrote:
> Don't know for sure, but I would suspect a 25L6. You'd want a 25 volt
> tube so you could run 26V on the heater.
>
>
> jhhaynes at earthlink dot net
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