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Originally Posted by TDRyan
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)
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Ah, so since a 6SQ7 is a 300ma tube at 6v, and the 12SQ7 is a 150ma tube at 12v, it wouldn't work because then you'd have one tube in the string that needs a different amount of current... and in series current is distributed evenly and voltage drops can differ - vs. in parallel where voltage is a constant and current differs.
Duh.
Well, so much for a convenient, elegant way to do it
. Yeah, resistor...
-Ian