'''5751''' is the designation for a low-voltage, low-noise avionics vacuum tube popular as a pre-amplification tube in guitar amplifiers. 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".<ref>{{cite book|last=Pittman|first=Aspen|title=The Tube Amp Book|url=https://books.google.com/books?id=JT1I7Ld76YsC&pg=PA132|year=2003|publisher=Hal Leonard|isbn=978-0-87930-767-7|page=132}}</ref>
==References== {{Reflist}}
== External links == * [http://tdsl.duncanamps.com/show.php?des=5751 Duncan's Amps TDSL.] * [http://www.tubemaze.info/tag/5751/ Reviews of 5751 tubes.]
Category:Vacuum tubes Category:Guitar amplification tubes