6AX5 will replace a 6X5 but filament current is double. Good sub if the power transformer doesn't get too hot.

Norm

::Cathode stripping or bombardment would only occur with a lot higher B+ voltages. Consider radios with a selenium rectifier. These never have any problem with instant B+
::
:I thought I read somewhere that the 6AX5 was a safe replacement for the 6X5?
:Elton
:


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