JJ GZ34 / 5AR4

8 Reviews
Best Seller

Availability: Usually ships within 24 hours.

USD $‎23.95
The JJ GZ34 / 5AR4 tube is another affordable replacement rectifier tube for both guitar and hi-fi tube amplifiers.

View JJ GZ34-S tube data sheet.

Other JJ Electronics tubes5AR4 Tube Types

Additional Information and Downloads

JJ GZ34 / 5AR4 Datasheet (PDF)

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Warranty Information and Return Policy

Warranty Period: 3 months

All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)

If you receive a tube that does not perform to the manufacturer's specifications, please do the following:

- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.

Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.

We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

8 reviews

Long lasting tube that performs very well.


The first one of these I installed was clear back in April 2012. I keep a record of most repairs I do on the Dynaco. It lasted, I estimate, about 8000 hours. When I got this one I also got a spare. That spare is just fine to this day in December 2018. Long lasting tube that performs very well.

Not recommended GZ34


Waste of money. Bought two for my Dynaco ST70 and gone lessl than a month.

The Most Musical Current Production GZ34; Just Replace It On A Schedule


Given how affordable these JJs GZ34 are, I just keep some on hand and replace them every 6-9 months. Not that I've had a problem, but as online comments show, some people have and a few I know personally. The reason I accept preventative replacement is that the GZ34 gives many amps requiring it a tight-sphincter sound that detracts from musicality. This JJ is easily the most elastic-sounding of the current production GZ34s. I use it in both guitar and hifi amps, where even a NOS Mullard sounds too Calvinist.

I have some hifi amps that are spec'd for GZ34 but have sufficiently relaxed B+ voltages to allow use of other rectifier types, where often a NOS 5V4 sounds exceedingly natural and musical. In those amps, if I run a JJ GZ34, the sound is more in the direction of the more elastic 5V4 than any other new production GZ.

At just 18 bucks you can cash in soda cans and whiskey bottles to keep yourself in rectifiers.