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. Nothing sounds as cool and sweet as a 12AY7 phase inverter, it has just been impossible to get nice matched ones in the past. 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 12AY7 tube in any application where a phase inverter / driver 12AT7 (Slightly lower gain + "tone") or 12AX7 (lower gain + "tone") 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 12AY7 in place of a 12AX7 will yield more clean headroom in your output section. Using the 12AY7 in place of a 12AT7 will provide SLIGHTLY LESS drive and a "sweeter bluesy" 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!! |
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