[Amps] GS-35B test at low voltage

[Alek Petkovic]

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.

73, Alek
VK6APK

On 25/04/2017 11:07 AM, N1BUG wrote:
> I have never worked with a GS-35B and it has been almost 20 years 
> since I had any triode experience.
>
> I have a VHF amp with a single GS-35B and a home brew bias board taken 
> from the G3SEK triode board manual. Per the test procedure described 
> in the manual, the bias circuit is OK with adjustment range of 27 to 
> 50 volts.
>
> After running filament and blower for 24 hours I wanted to see if 
> everything looked OK with low B+ and run it with some idling current 
> for 24 hours. The only supplies I have are 4000V and 1000V. With 1000V 
> on the amp there was no sign of idling current and bias adjustment 
> range was 12 to 15 volts. I realize this is very low B+ for this tube 
> but I expected to see some sign of life.
>
> I am assuming I have a bad tube. Any other possibilities? Other checks 
> I can or should do?
>
> 73, Paul
>

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