[Amps] GS-35B test at low voltage

[N1BUG]

On 04/25/2017 12:50 AM, Alek Petkovic wrote:
> According to the curves, with 1kV on the anode, it only starts
> conducting when bias is less than 10V or so. At 0V, she'll run at about
> 200mA.
>
> Kill the bias and try it.

Aha! Thanks for the wake up call Alek. At 500V with zero bias it is 
drawing 100 mA and at 1 kV 200 mA. It's alive!

As a follow-up on other comments... I will be running this amp on 4 
kV. I had read and been told several times that letting it cook a 
few hours at 50% HV with some idling current was a good idea during 
tube prep. I didn't have 50% HV available, so I tried 25% without 
properly understanding the tube curves.

I will decide what to do from here. I have a 160 kOhm 200W resistor 
I can put in series with the 4 kV for a few hours as suggested on 
ND2X.net.

I do have a 0-10kV hipot tester but would like to give the tube 
every reasonable chance to get gas free before I try that. I'd like 
to see it pass the first test rather than fail it.

-- 
Paul
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