New Matched Quad (4) Electro-Harmonix 12DW7 / ECC832 Vacuum Tubes

New Gain Matched Quad of Electro-Harmonix 12DW7 / ECC832 Vacuum Tubes

Superior dual triode preamp tube. One triode is a high-mu 12AX7 equivalent, and the other a medium-mu 12AU7, combined in this dual triode.

• New design of excellent quality

• Relabeled Electro-Harmonix vacuum tubes are used by many OEMs in their amplifiers.

Electro-Harmonix tubes are all new designs and are of excellent quality. If you want great sounding tubes at a very reasonable price, then Electro-Harmonix tubes should be on your list.

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.