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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