Well, I guess the 26 is where it all started

Tubes Asylum

Questions about tubes and gear that glows. FAQ

In Reply to: Which vintage DHt tube would be close to 6j5 ? posted by Wojciech on March 17, 2023 at 15:56:20:

See link below.
The 27 was an indirectly heated 26, it appears -- and you probably already know the story from the 27, 56, 76, through to the 6J5, and then 6SN7 (and at least as well as I). If not, you can see their entries on the same website and/or look in any tube manual(s) of the proper era(s). :)

source: https://worldradiohistory.com/BOOKSHELF-ARH/RCA-Books/RCA-Receiving-Tube-Manual-1937-RC-13-OCR.pdf

all the best,
mrh
https://vinylsavor.blogspot.com/2015/05/tube-of-month-26.htm (Open in New Window)

Edits: 03/17/23 03/17/23 03/17/23

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Follow Ups Full Thread

Topic - Which vintage DHt tube would be close to 6j5 ? - Wojciech 15:56:20 03/17/23 (6)

A Triode wired Directly heated 47 pentode would be around mu of 20~nT - Cleantimestream 15:04:05 03/26/23 (0)

Nothing close to mu=20, plenty of mu=8 - andy evans 03:23:11 03/18/23 (3)

RE: Nothing close to mu=20, plenty of mu=8 - FlaCharlie 13:31:49 03/18/23 (2)

Well, yes, some odd DHTs with higher mu - andy evans 02:53:55 03/19/23 (1)

RE: Well, yes, some odd DHTs with higher mu - FlaCharlie 06:50:36 03/19/23 (0)

Well, I guess the 26 is where it all started - mhardy6647 17:04:12 03/17/23 (0)

Follow Ups

Well, I guess the 26 is where it all started - mhardy6647 17:04:12 03/17/23 (0)

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