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Originally Posted by RetroHacker
you could simply replace a 6SN7 with a 12SN7, or a 6SQ7 with a 12SQ7
-Ian
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Plug 'n' play?? Uh, no, you could not. Tubes with different filament currents are staggered into different sections of the string. Maybe replacing a 25Z6GT with a 35Z6G (both 300ma) would make enough difference in the string, but adding a resistor is probably the best idea.