New Matched Pair (2) Genalex Gold Lion CV4004 / 12AX7 Vacuum Tubes

New Gain Matched Pair of Genalex Gold Lion CV4004 Short Plate Vacuum Tubes

Genalex Gold Lion is the flagship brand among Electro-Harmonix products and it’s no wonder. They started by offering the standard long plate 12AX7/B759 which, while an excellent tube, tends to be a bit noisy. The Genalex CV4004 was designed with the same high standards as the long plate 12AX7, but offers improved a significant reduction in noise and microphonics. The short plates and spiral filament help cut down on noise.

The CV4004 designation is simply what that British called their short plate, low noise 12AX7 in the 1950’s. This is the same tube as a 12AX7, 12AX7A, ECC83 etc and will work in any amplifier that calls for them.

This is the real deal, made in Russia. 

Testing and/or Matching

At VIVA TUBES, all of our customers get the same high standard of testing and matching. Some sellers charge more for premium matches but we believe all of our customers should get the same level of quality and service. 

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).

Hand written test data included.

Note that we do offer a few models which are tested & matched at the factory. 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. 

Guarantee

We offer a minimum 90 day guarantee covering functional defects - including noise unless otherwise stated. The guarantee period begins the day you receive your order.