From: John Thaden Date: Tue, 08 Feb 2000 18:54:25 -0600 Subject: Re: 7025 vs 5751 JAN
>I'm not quite sure that the 5751 is really an amplification factor of 70 >(might be a bit more). My understanding is that the 5751 is an >industrial application version of the 12AX7. The amp factor is >probably a bit lower because of the "heavy duty" construction > (I don't really know).
"Tube Lore", by Ludwell Sibley, says the following:
5751: Ruggedized computer-rated 12AX7; mu reduced to 70 (from 100), heater raised to 175 mA per section (from 150) (GE, RCA, SY, TS). Released 10/49.
>The 12AT7 and 5751 may have similar gain
The same source lists the mu of the 12AT7 as 62 (and the heater at 150 mA). The "WA", "WB" and "WC" variants are ruggedized versions w/ progressively tighter process controls.
