5751 is the designation for a low-voltage, low-noise avionics
vacuum tube
A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
The type known as ...
popular as a pre-amplification tube in
guitar amplifier
A guitar amplifier (or amp) is an electronic device or system that strengthens the electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which ar ...
s. The 5751 is a modified version of the
12AX7 and, having a gain factor of 70-80 (as opposed to the 12AX7's 100), is used to "soften up a harsh modern amp".
References
{{Reflist
External links
Duncan's Amps TDSL.Reviews of 5751 tubes.
Vacuum tubes
Guitar amplification tubes