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12bh7 substitution in pilot sa 260

Hi everyone.
I was wondering if i could substitute this tube safely in the 12au7 position in the pilot amp.
I tried it briefly and the difference was not subtle.
I understand that i have to watch the heater current but i dont know what or how to check.
any help would be appreciated.
the schematic can be found here
http://www.ainamoi.com/pilot.htm
thanks



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Topic - 12bh7 substitution in pilot sa 260 - pennyford 07:59:20 02/26/12 (14)

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