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MF MD HG 72 Hour Accesssory Sale 10-20-14

Groove Tubes Gold Series GT-5U4 GZ32 Rectifier Tube  

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See All Groove Tubes Rectifier Tubes
Groove Tubes

The Groove Tubes GT5U4"GZ32 rectifier tube is commonly found in many medium powered amplifiers such as the Fender Blackface amps. The Gold Series GT-5U4 is the factory selected rectifier for the Mesa Dual and Triple rectifier series. Common to medium powered amps like the earlier Fender Super Reverbs and Bandmasters. May be used to replace a 5Y3 for improved dynamics and power. Also some players have replaced their 5AR4 (GZ34) with the 5U4 in their Vox AC30 amps to reduce heat and extend the life of the power tubes. Groove Tubes recommends this procedure as a stability enhancer, if you can live with the slightly lower power.

Country of origin: Russia


Gold Series GT-5U4 GZ32 Rectifier Tube Specifications:

  • Country of origin: Russia
Customer Reviews

Review Snapshot®

by PowerReviews
Groove TubesGold Series GT-5U4 GZ32 Rectifier Tube

(based on 3 reviews)

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Reviewed by 3 customers

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Not as advertised

By tp

from Northern ILL

About Me Experienced

Verified Buyer



    • Poor Quality

    Best Uses

      Comments about Groove Tubes Gold Series GT-5U4 GZ32 Rectifier Tube:

      Received this tube along with others I ordered that were shipped quickly, but had no packing material. Usually there will be something to avoid shipping impact. Five tubes were placed in a box with a packing list, nothing else. At least they did not look damaged.

      Upon opening the box for the rectifier, I noticed it looked nothing like the one I ordered. The shape and base color were different. The tube is stamped GT on one side and Electro-Harmonix on the other. It appeared to look just like the other 5U4GBEH branded E-Hs I saw online for less than half the amount.

      I did a quick look at MF's site to verify what I had ordered. Again, it did not match what I had ordered. Because I needed the tube, I placed it in my amp and hoped for the best. The amp came to life, but after five hours it has become extremely noisy. For something labeled as Gold Series or premium, it is not what I am experiencing.

      I now have to replace the tube because of the noise. I am forced to look elsewhere.

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      Comments about Groove Tubes Gold Series GT-5U4 GZ32 Rectifier Tube:

      currently made. These are Svetlana (SED) tubes and they are still being made, although, apparently, a very large number of these tubes from the late 60's were recently shipped and probably thats what most of these GT rectifiers are. Its an outstanding rectifier with a slightly lower output than the 5U4GB, but a higher output than a 5Y3GT type. They look great and perfrorm just as well.

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      Groove Tube 5u4 rec. tube

      By PRSplaya6969

      from Phoenix, AZ

      Comments about Groove Tubes Gold Series GT-5U4 GZ32 Rectifier Tube:

      These tubes breathed new life into my Mesa Dual Rec. I'm definitely sticking with these.

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