Electro Harmonix 12AY7 Tube

New Gain Tested Electro-Harmonix 12AY7 / 6072A Vacuum Tube One of the only current production 12AY7 tubes on the market. This tube has proven itself and has stood the test of time. Molded after the famous GE 6072A - this tube has the correct medium mu gain of a 12AY7 or 6072A that ...New Gain Tested Electro-Harmonix 12AY7 / 6072A Vacuum Tube One of the only current production 12AY7 tubes on the market.

This tube has proven itself and has stood the test of time. Molded after the famous GE 6072A - this tube has the correct medium mu gain of a 12AY7 or 6072A that many early amplifiers require. This tube has a rich and lush sound that resembles a dialed down RCA 12AX7 and is perfect for any guitar or stereo amplification.

Tubes are tested and/or matched at full operating voltage with regulated power supply on a Maxi Matcher tester for general mutual transconductance (Gm). In addition, power tubes are tested/matched by plate current (Ip) and preamp tubes are tested/matched by gain. Rectifier tubes will be tested for emissions on a calibrated military grade tube tester.

Our goal is to match within 5% with an upper limit of 15% (15% is the industry limit to consider a set). They will be matched by the same parameters (Ip & Gm) but to the manufacturer's standards. Factory testing will be indicated in the item title and description.