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12.4.185.2
In Reply to: RE: comparison among the best NOS 5751 (12ax7) posted by paco on January 15, 2015 at 00:02:27
They draw more heater current that 12AX7s. So if your power supply is barely adequate with 12AX7 in place, it might be pushed to the edge with 5751s (depending on the number of tubes, of course).
Just speaking from experience (and comparing datasheets as well)...
Dman
Analog Junkie
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At 6.3V, 12AX7's draw .30A, whereas 5751's draw .35A.
If a transformer can't handle another .05A (X the number of tubes), it's pushing the limits on current headroom already, and a pretty crappy design IMHO.
I've seen it happen...
Dman
Analog Junkie
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