New Sovtek 5AR4 / GZ34 Vacuum Tube

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One Brand New in Box Sovtek 5AR4 / GZ34 Vacuum Tube

The Sovtek 5AR4 / GZ34 is one of the most popular rectifier tubes in audio and guitar. The vintage ones are in short supply, and this affordable Sovtek is the perfect replacement which will give you the best tone without breaking the bank. Fender, Mesa and many other manufacturers have chosen this as their stock tube. The 5AR4 will work in place of a 5U4 or 5Y3.
Will work in place of: 5AR4, GZ34, U77

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. 


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

offreverb_condition=Brand New"
Item Type:
Vacuum Tubes
Production Era:
New/Current Production
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