Preferred Series 274B / 5U4G

7 Reviews
Best Seller
SKU: PS-274B
USD $‎39.95
The Preferred Series 274B tube is a full-wave rectifier that is very similar to the classic 5U4G. This 274B tube's filament draws 2.5A of current. This current draw makes it acceptable for many amps originally designed for a 5AR4/GZ34 tube. Our PS-274B tube is a beautiful large coke bottle shaped rectifier tube with large black plates. The installed height is 5 inches. Its width is 2.5 inches at the widest point. Space may be an issued in some amps so be sure to check this.

This tube is produced for us in China by the Shuguang factory. A new evacuator is utilized for a much longer time period increasing vacuum over 100 times more than their current 5U4G tube. A new cathode coating process provides a much smoother finish improving electron flow and they are burned in at high voltages for a much longer time for improved stability. The end result of utilizing these new production materials, techniques, and equipment is a premium rectifier tube at a much lower cost than the NOS Western Electric 274B.

As a Preferred Series tube these are further tested on our digital high voltage equipment to make sure the tubes selected for you will provide outstanding tone and performance.

Warranty: The Preferred Series 274B tubes carry a 6 month extended warranty.

Other Preferred Series tubes          5U4 Types

Warranty Information and Return Policy

Warranty Period: 6 months

All our Preferred Series tubes are guaranteed for 6 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 6 months 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 6 months, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

7 reviews

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Great Tube used in my custom hi fi amp and pre. They look great and are very large.
Has air and 3d sound that I do not get from a 5u4g tube either NOS or new production. Best sounding tube for the money IMO. Have used a few of these for 6 months or so and are holding up well.

Very Pleased


I use this rectifier tube in a home built 5E3-style amp and the sound great. The 274B is significantly less spongy than the standard 5Y3GT that is usually found in that circuit. The 274B adds headroom, clean(-ish) tones and volume.

I would recommend this experiment with 6V6's that can take punishment. I've tested with EHX, TAD, Tung-Sol and Mullard (even though the Tung-Sols and Mullards are not known for being particularly rugged). Right now I'm switching between Tung-Sols and Mullards.

274b Rectifier tube


I recently had a DHT preamplifier built and choice of 5U4G or 274B. This 274B rectifier tube is a great tube for the money it has a nice smooth balance.
Adds nice depth and very stable expanded soundstage. Very close to the Sophia in quality for far less money. To get noticeably better you would have to buy the Emission Labs 274, but is expensive.

My go-to tube rectifier


In hifi use, this rectifier has NOS Mullard GZ34/5ar4 in all of my gear that is tube rectified. It neatly splits the difference between the euphonically forgiving-but-undisciplined sag of a 5u4, and the sometimes-too-tight-sphincter of a vintage 5ar4. In Melody Pure Black 101 and P7688 preamps, and in Quad II Jubilee power amps, I get burstier dynamics, deep bass finesse without bloat, best soundstaging and fluid musicality that exceeds any other rectifier I've used in the last 40 years. Also has proven durable. I also use it for tone and dynamic improvements in guitar amps where it fits.

Great rectifier tube for pre-amp, and at a reasonable price.

by -

I replaced the stock tube in my Aric Audio Transcend pre-amplifier with this one. While the preamp was wholly satisfactory with the stock rectifier, this tube seemed to give me a little more space and extend the bass a bit. Note: I was unable to do side by side comparison, since the original tube had burned out.