New Matched Pair (2) Genalex GZ34 / 5AR4 Rectifier Tubes

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Pair U77
Pair U77
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Maximum Purchase:
25 units
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New Matched Pair (2) Genalex GZ34 / 5AR4 Rectifier Tubes

The Genalex reissue GZ34 / U77 / 5AR4 is probably the best new production GZ34 on the market. New Sensor Corp. put an incredible amount of effort into these and got it right down to the classic saw-tooth edge plate construction. If you need stable DC voltage, look no further. It’s wise to invest in a good GZ34 as these rectifiers run hot and cheap ones burn out quickly.

Will work in place of: U77, GZ34, 5AR4& more.

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 10% (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. 


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.

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Additional Information

GZ34 5AR4 U77
Brand New
Item Type:
Vacuum Tubes
Production Era:
New/Current Production
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