A single 12AX7/12AT7/12AY7/12AU7/5751 contains TWO circuits within the tube. These tubes are tested to find the INDIVIDUAL SINGLE TUBES in which these two circuits are MATCHED - 1 tube contains two circuits. We found our suppliers could not provide us with enough high quality Matched Preamp Tubes so we designed and built our own Tube Matching Machine accurate to .00002A measurement - super accurate. Now we can provide matched high quality preamp tubes all the time. The benefit of this tube in a guitar or bass amplifier is a matched output section. With a matched triode the upper and lower portions of the output waveform will be much more equal. When this waveform is not equal, differences are cancelled out in the feedback loop of class A/B amplifiers and are noticed as a lack of sustain or apparent "dead spots" in areas of the fret board. At high levels at all frequencies, sustain will be improved. This is even more critical in Class A amplifiers such as the Torres Class A Models, Vox AC-30's, Matchless and other Class A amplifiers. Improvements are heard in both Class A and Class AB amps. Use the Matched 5751 tube in any application where a phase inverter / driver 12AT7 (Slightly higher gain) or 12AX7 (slightly lower gain) tube is specified. The phase inverter / driver position of a guitar or bass amp is a current driving position, and not part of the tone generation stage. Using the 5751 in place of a 12AX7 will yield more clean headroom in your output section. Using the 5751 in place of a 12AT7 will provide more drive and a fuller tone. The tube types are interchangable without any adjustment required, so feel free to experiment! They are a very noticeable improvement in tone in your amp!! |
FREE SHIPPING ON ANY ORDER OVER $60.00 - FREE! (in the U.S. onlyNOTICE - THE ORANGE DROP CAPACITORS USED IN OUR KITS HAVE BEEN 100% DISCONTINUED BY THE MANFACTURER FOR EVER. THEY WILL NEVER BE MADE IN THE U.S. AGAINHIGH QUALITY Mallory Tubular Capacitors will be included in your kitwe apolgize for this, but no one anywhere was warned or informed in any way prior to discontinuance.We can install any and all of our kits in our custom workshop - email for info.Check out Torres Guitars.com our new info site
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