Brand New Electro-Harmonix Gold 12AX7 Matched Quad (4 tubes). The Electro Harmonix 12AX7 Gold provides high gain with ultra low noise and a detailed, musical tone that rivals the most desirable NOS types. Unique spiral filament eliminates filament to cathode induced hum common on amps that use AC on the filaments! The gold pins allow for better contact in the tube socket over time.
At Tonal Tubes we test and match preamp tubes using an instrument that allows us to test tubes for gain, transconductance, and noise, at real world voltages that would be seen in a guitar amp or hifi amp. We test every single tube that we receive to make sure it matches our standards. All tubes are also checked for shorts and leakage on a separate tube tester to ensure that all tubes will work flawlessly in your equipment. For our preamp tubes we match with a maximum difference of 10% for both gain and transconductance for each side of the tube, as well as both tubes in the pair.
12AX7's are two tubes in one glass envelope, that's why they're called a dual triode. Most other retailers will match to only one of these values, however it is important to have both of these specs matched. This is not a simple process and does take some time and dedication since tubes can vary so much from the factory.
An example would be a 12AX7 tube that measures 95.5/97.8 for gain, and 2100/2285 for transconductance. This tube would pass our tests. Why You Should Do Business With Us. Every single tube is checked for shorts and leakage on a calibrated Eico 667 tube tester. Comes with original packaging straight from the factory, as shown in the picture.
We are musicians who crave awesome tones. We all know that swapping out tubes can be one of the more effective ways of improving your tone.At Tonal Tubes, we help you achieve that next level tone. The item "New 4x Electro Harmonix Gold 12AX7 / ECC83 Matched Quad / Quartet / Four Tubes" is in sale since Tuesday, June 7, 2016. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "tonaltubescom" and is located in Durham, North Carolina. This item can be shipped worldwide.