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Preamp Rectifier Tube Confusion

I have a Primaluna Prologue 3 which uses 5AR4 rectifier tubes which id like to roll. I’m looking at ShuGuang WE274B tubes which list as replacements for 5AR4 / 5U4G / 274B. 
However, the Primaluna manual lists compatible tubes as: GZ34, CV1377, 5V4G, 5T4, 5Y3 and Upscale Audio also list the Philips 5R4GYS.

Any idea if the ShuGuang would work?
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Showing 3 responses by mofimadness

mofimadness's avatar
mofimadness
5,199 posts
 
This is a quote from a recent review in TAS on the PrimaLuna EVO400 Preamp:

"To my mind, the 5AR4 tube rectifiers were at least partly responsible for the preamp’s tonal integrity, fleshing out the lower octaves and, in particular, infusing upright bass and cello with a full complement of tonal heft."


+1


mofimadness's avatar
mofimadness
5,199 posts
 
Here's an excellent, (although quite long) thread on just these tubes:

https://www.head-fi.org/threads/dubstep-girls-massive-5ar4-5r4-5u4g-rectifier-review-comparison-rect...
mofimadness's avatar
mofimadness
5,199 posts
 
Ralph... I think the world of you and have learned very much from you over the years.

I just posted what was written in the review.  However, I have sold, (as a dealer) and owned, (personally), quite a few preamps that have had tube rectified power supplies.  I have found without question, that I could change the sound by replacing the tube rectifier.  If this indeed due to a voltage increase or decrease, so be it, but it did and does change the sound.

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