Not really,
its quit common that tubes like YL1050, TH347 etc. which are very high gain
metal ceramic tetrodes for linear mode of small tv-transmitters and linear
service arc internally from time to time.
It does not matter whether they are new out of the box or being in service
for a long time.
Those tubes are extremely expensive and nobody throws them away.
Everybody uses the circuitry in the power supplies which the manufactory
suggests and never a grid fuse or grid resistor but direct ground
connection.
The YL1056 in my 2m amp is running now perfectly for almost 20 years with
regular arcs even in standby, it does not matter at all, the P/S quickly
resets and during a contest I do not loose any qso by that.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Will Matney
If a tube arcs internally, it's gassy as an arc can't form in a vacuum. It
needs to be replaced no matter what
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