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RE: The one with the lowest voltage drop

172.11.32.65

In Reply to: RE: The one with the lowest voltage drop posted by Fullrun on December 29, 2024 at 15:27:38

Real NOS are often stronger than new manufacture tubes, tubes don't diminish sitting on a shelf. There are a lot of flavors of 5U4 as well as manufacturers. Each of the following tube designations represent slightly different construction and performance: 5U4, 5U4-G, 5U4-GA, 5U4-GB, 5U4-GT, 5U4-WG, 5AS4.
Can't go wrong with a 1950's RCA 5U4GB. You want more of an audible difference plug in a couple of (Real, English) Mullard 5AR4s.

Edits: 12/30/24

Follow Ups:

RE: The one with the lowest voltage drop - Fullrun 13:02:31 12/30/24 (0)
Thanks! Have been using 1950s RCA 5U4G Back Plate...and as back up 5X4. The amps was designed around specific tubes...not sure I can crossover to 5AR4s

Your input has been very helpful.

Thanks!

In music as in life... one is always on the learning curve

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