[Amps] Photos posted of high voltage test setup of a YC-176

[gdaught6 at stanford.edu]

LB3HC wrote...

<snip> 

>  I assume I have a good tube when it shows that low leakage at 16KV (DC). Any opinions on that?

That's assuming a bit too much.  I'd say it means you have a good VACUUM, but:

the filament might be open, or have low emission

the grid might be damaged from a previous overcurrent event(s).

the grid might be shorted to the filament.

But, so far, it looks like you might have a good tube.

The next thing I'd do is test interelectrode leakage between the other elements.  

Then, I'd see if the filament works, i.e. draws the correct current at the correct 
voltage.  If you heat the filament for more than just a few seconds, be sure to provide 
some cooling air. 

Good luck es 73,

George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 6-7, 2012