In researching a "retro" amplifier design for a collector
who would like to commission a tube amplifier project,
the possibility of using 0D3 type cold-cathode gas
regulators came up in conversation.
On further research I found a very cheap supply,
but the admonition of "they only last about a year,"
accompanied the information of availability.
Why would these tubes only last a year if they
were properly current-limited?
Hal Mandel
W4HBM
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