• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

PX4 Trauma

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316a

316a

Member
Joined 2002
Hello ,
I finally found a use for the pair of PX4 I had sitting around . They both test very close , but one of them has erratic anode current on the tester . It seems to vary +/- a few mA after a minute or so , never seen this before . I've reflowed the pins no difference . When the valve is tapped no difference . It just does this randomly . There is a slight blue glow around the inside of the glass but no grid current drawn on the gas test . Anyone have any ideas what is going on ? Oven baking job perhaps ? Fingers crossed the thing is not a write-off . Otherwise anyone have a spare they can swap for my single finned anode ST ACO44 ?

cheers

316a
 
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