Tube Amp Doctor (TAD)

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Vacuum Tube - 5AR4 STR, Tube Amp Doctor

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Item ID: 004556
Price: $27.90
In Stock

Tube Amp Doctor 5AR4 Rectifier, Premium Selected

A faithfull reproduction of the Mullard/VALVO GZ34.
Pure power and the typical sag have been the distinguishing characteristics of the most popular guitar amps of guitar heroes since the 1960s.

Upgrade for 5U4GB and 5U4G.

Q: When does a tube become a Premium Selected tube?
A: All tubes labeled Premium Selected have passed the following tests:
- Plate Current (PC) and Amplification (TC)
- Low Noise Test
- Microphonic Test
- Sonic Tests
- Shock Tests
- Listening Tests
- Shorts & Leakage Tests

UPC/EAN: 609722123310
Tube Amp Doctor Part Number: RT501

RoHS Compliant

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Product Reviews

5.00 out of 5 based on 6 reviews
5 out of 5

Knock on wood - I've had this beast for 5 years to the day as I write this - no signs of stopping now. Absolutely worth every penny. Fantastic product!

- February 9th, 2020
5 out of 5

Installed these tubes in my Germino Club 40 along with a TAD GZ34. Phenomenal amp and these tubes are quiet and very musical. Superb cleans and perfect overdriven tones. Paired with a vintage 68 Vibrolux Reverb the two amps present a glorious choir of rock tones.
Very pleased with the purchase.

- February 1st, 2020
5 out of 5

Solid 5AR4 at a GREAT price..FORGET buying NOS 5AR4 tubes, the prices are just stupid now, and whats the point ? This is a very good copy of the Japanese made, Phillips design 5AR4 that was so common in the 80's. and 90's..Now they are selling for 75 dollar a piece and more . My own favorite 5AR4 is the Russian one, and this is based on hundreds of hours of use..but they cost 10- 20 dollars more too.

- September 30th, 2018
5 out of 5

Replaced a brand new Ruby with a TAD 5AR4 STR and found it to have a little more beef and vibe. Will definitely use them over other new production 5AR4s.

- October 14th, 2017
5 out of 5

The tube worked great. Prompt shipping, good packaging. Thanks!

- November 30th, 2015
5 out of 5

These TAD 5AR4 rectifier tubes are the best! I built my own high end reference tube amplifier 5 years ago, I used cheaper 5AR4 rectifiers and they lasted about 6 months. I switched to the TAD Premium Selected rectifiers and they have been working flawless for the past 4 years. I want to add that in 4 years time I have played this amplifier the equivalent of 12-15 years. There are many days it is playing 15+ hours a day for the past 4 years.
TAD makes the best, most consistent, reliable 5AR4 rectifier tubes that I have ever used! I have twin power supplies and even after all the use on these tubes, the B+ comes up at the same time on both power supplies. Timed cathodes allow the 6L6's to generate a good electron cloud before the B+ is applied to the plates so that cathode stripping doesn't occur in the 6L6's.
I highly recommend the use of Tube Amp Doctor Premium Selected 5AR4 Rectifier tubes. The sag/voltage drop is very low and with proper filtering of the rectified B+ I have 0.001 volt of AC going into my reference amplifier. No hum, no buzz.
I could write a book about how much I love these tubes, but if your looking for the most reliable, consistent, durable rectifier tube, you need to try the TAD 5AR4 Premium Selected tube.

- June 19th, 2015

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Substitute Products

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