Vacuum Tube - 5AR4 / GZ34, JJ Electronics

Vacuum Tube - 5AR4 / GZ34, JJ Electronics

JJ Electronics
Vacuum Tube - 5AR4 / GZ34, JJ Electronics image 1
Vacuum Tube - 5AR4 / GZ34, JJ Electronics image 2
Customer image:<br/>"JJ GZ34 in a Dynaco ST70 amp"
Customer image:<br/>"Heathkit AA-111"
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Vacuum Tube - 5AR4 / GZ34, JJ Electronics image 1Vacuum Tube - 5AR4 / GZ34, JJ Electronics image 2
Customer Images:
Customer image: "JJ GZ34 in a Dynaco ST70 amp"Customer image: "Heathkit AA-111"
In Stock

The JJ Electronic GZ34 / 5AR4 is rugged rectifier at a reasonable price. JJ has a reputation for building sturdy tubes and this one is no exception. Users report that the JJ GZ34 / 5AR4 is a reliable rectifier in their Vox, Fender, and hifi amplifiers.

Item ID:
JJ Electronics Part Number:
GZ34S - 5AR4
JJ Electronics
RoHS Compliant
Product Measurements by Type
Body Height79.0 mm
Filament Current (If)1.9 A
Filament Voltage (Uf)5 V
Item Diameter33.3 mm
Item Height93.0 mm
Packaging Information
Packaging Dimensions1.6 in. × 1.6 in. × 4.8 in.
Weight (Packaging)0.1063 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet460.63 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on February 15th, 2017.
Matt H.
February 15th, 2017
Staff Member
If your amp calls for a 5AR4/GZ34 then these should work. I would consult your manual or examine your amp to see what type of rectifier tube it has in it.
Asked by Anonymous on September 23rd, 2017.
Matt H.
September 28th, 2017
Staff Member
According to our tube substitution handbook, the 5AR4 is not a substitute for the 5U4GB.

Product Reviews

4.44 out of 5 based on 18 reviews
- March 5th, 2021
1 out of 5

It shorted out after 2 minutes of warm-up. Ran for a minute after cooling off then would blow a fuse every time.

- September 21st, 2020
5 out of 5

I have purchased these before, they seem to work fine. Its crazy the things we do. We buy tubes to make dc instead of ac when two 20 cent diodes would do what an expensive tube does. I have found JJ tubes to work well in most situations. I bought some tubes so I will have some spares when I do need them. It could be days or years before I need them, but good to have on hand. Thank You

- August 10th, 2020
5 out of 5

Tube looks great

- July 1st, 2020
5 out of 5

Original GZ34s are too expensive. This remake seems to do quite well in an older Fender amplifier replacing a 5Y3.

- June 20th, 2020
1 out of 5

I tried two of these tubes and one failed after 30 minutes, the second (a replacement) immediately developed a cathode to filament short power was applied.

Vintage, used 5V4 and 5AR4 tubes are running reliably in this transmitter, however.

I would suggest avoiding JJ brand tubes, it has been very frustrating and an
expensive lesson, with all of the return postage, and loss of the tubes.

- March 31st, 2020
5 out of 5

Bought a JJ 5AR4 for a Heathkit AA-111 amplifier that I'm restoring/updating.
It's working well and I decided to pick up a couple more for spares. Hard to beat the price!

- March 8th, 2019
5 out of 5

Excellent choice for my vintage Princeton Reverb

- January 29th, 2019
5 out of 5

Great service and communication.

- December 20th, 2018
3 out of 5

I purchased this tube (GZ34S) in for use in a Dynaco ST-70 I rebuilt. It worked great for about 5 weeks then I accidentally hot switched the amp and the rectifier promptly flashed over internally. Yes, this is my fault but upon examination of the tube under the magnifier the cathode and plate connections on one side were just too close to each other.

I rated the tube a 3-star for product construction, perhaps this is too harsh but darn it...

On the other hand, I am very happy this was only a $15.00 tube! I would buy it again, especially for trying out new constructions and first time power up.

- May 24th, 2018
5 out of 5

I must agree with others who used these rectifiers. The price is right and you get more for your money than other choices. I am using them in a pre-amplifier that used 27's and 8 red LEDs for cathode bias and outputs to a 245 amplifier via 10K interstage transformer and I think they contribute to the smooth sound this gives me.

Substitute Products

The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.