Newbie- Tube Testing RF Amp tube - diyAudio
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Old 25th October 2011, 05:44 PM   #1
diyAudio Member
Join Date: Oct 2011
Default Newbie- Tube Testing RF Amp tube

I am replacing a pair of 6293 (similar to 6146A) for my ham HF tranceiver. On testing a batch of NOS 6293 on a Hickok 539C, I find the occasional high outlier. Most of them test around 8800-1000 Gm with plate currents around 55-65ma (tube data shows min Gm 4600). Every once in a while I find a tube with real high Gm values almost double ~ 17,000 with lower plate current ~50ma. Is this due to a bad tube oscillating? Any special technique to test such a tube?

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