5% I believe. My GE datasheet doesn't state it, but +/- 5 or 10% is the
rule of thumb.

Tim

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"Rick Ralston" wrote in message
news
What is the +/- % of deviation that can be applied to heaters on say
12ax7
tubes. I am rebuilding a small single ended 7695 amp and after I got the
heater supply wired the voltage on the 12ax7's is in the 13 volt range.
Any
help would be greatly appreciated.