[Collins] 872a Lamp, revisited

[Jim Brannigan]

Jerry, Bob,
After I hit send I realized that 2KV was a bit much.  I've used 866's as low
as 1KV and there was plenty of "glow",
I'm not sure what the practical threshold voltage is.

I do miss the "buzz" and pulsing blue glow of 866's in a CW rig.

Jim


> Jim, I don't think its going to take 2 KV across the tube the light it
> up. Probably 100 volts though and lots of current. I could probably hunt
> up an 866 and supplies and try it but I'm not that interested compared
> to other things occupying my work bench at the moment. I think the
> lighting is from forward drop, not reverse drop.
>
> For sure with a 2KV transformer and 1 KW load the tube will light well.
>
> It might be more effective to light the tube with an electric field, but
> that's getting esoteric.
>
> 73, Jerry, K0CQ, Technical Advisor to the CRA.