>> To: amps@contesting.com
To: <amps@contesting.com>
>> Date: Mon, 8 Sep 97 12:43:48 +0000
>
>> Don't see much commentary on the L-4B, but mine just cratered. Was
>> in standby when a crack and long fizzle sound came out of the RF section.
>> The grid resistor opened up, and the meter needle pinned to the left
>> (minimum) direction.
>
>Most likely a tube arced internally Jim, although it's tough to say
>for sure.
>
Nah, it's easy. Check the tube with a high-pot. tester in a dark room.
If the insides glow blue at 3kV, a gas arc is definitely a possibility.
If the tube has a normal vacuum, the leakage will be under 10uA at 8kV.
Rich---
R. L. Measures, 805-386-3734, AG6K
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