2. amps-preamps
  3. 159918-149763

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?
jl1ny

Showing 8 responses by jl1ny

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jl1ny OP
419 posts
 
@jetter The 5AR4 is the PL stock rectifier.
jl1ny's avatar
jl1ny OP
419 posts
 
@mofimadness Hey thanks for the link! Thats a great reference 👍
jl1ny's avatar
jl1ny OP
419 posts
 
@roberjerman Thanks for that. 
jl1ny's avatar
jl1ny OP
419 posts
 
@jjss49 I did! replacing the OEM 12AX7/12AU7 with Gold Lion. But I fell down the rectifier rabbit hole when I read about the Philips 5R4GYS. Ima sucker for aesthetics...the WE274B is sexy piece of glass! I figured if I can improve sonics AND have some cool looking glass then why not? 
jl1ny's avatar
jl1ny OP
419 posts
 
I reached out to Upscale and their response was: “I cannot give you an endorsement or recommend it, but it does say it is an equivalent”.

Im curious to see the performance stats of the WE274B compared to 5AR4.
jl1ny's avatar
jl1ny OP
419 posts
 
@atmasphere Thank you for the science lesson! Fascinating stuff 🤯
jl1ny's avatar
jl1ny OP
419 posts
 
Philips 5R4GYS in the house! Beautiful glass...haven’t had time to give them a critical listen.

https://freeimage.host/i/2oG08B
jl1ny's avatar
jl1ny OP
419 posts
 
@jjss49

I have my 3 favorite recording’s that are superb at demonstrating vocals, soundstage and separation. They also do the magic act and make the KEF Q150’s disappear...if I can’t hear a difference then I’ll chalk up the 5R4GYS to pure aesthetics. 🤷🏼‍♂️
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