> Adjusting filament-v is simpler than tuning a tank. Several models of
> Henry Radio amplifiers use approx. 6v on 3-500Z/8008 (4.8v) filaments.
> How safe is that, Mr Subich?
3-500Z's have 5 volt filaments, not 4.8. Your twisting of numbers
reminds me of the national budget!
While running proper voltage is a good idea, the number of tubes
that fail in amateur service from loss of filament emission is
extremely low. The largest failure mode by far is gas ingress or
poor welds.
73, Tom W8JI
w8ji@contesting.com
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