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?
128x128jl1ny
jetter
3,052 posts
 
jl1ny, just wondering how you ended up with a 5AR4 in your preamp if it is not spec'd for it?
roberjerman
4,319 posts
 
All you will get with different rectifier tubes is a different voltage drop of the B+ voltage. And a corresponding change in voltages throughout the circuit. Use the rectifier that the circuit was designed with! A rectifier tube is NOT part of the music signal!
jl1ny's avatar
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. 
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