one difference

Tubes Asylum

Questions about tubes and gear that glows. FAQ

In Reply to: Is a 6CA7 essentially a heavy duty EL34? posted by AbeCollins on April 12, 2010 at 18:29:10:

The "fat bottle" 6CA7s are beam tetrodes, while the EL34s are true pentodes. With the EL34 you can play some tricks with the suppressor grid, for example Decware's "Hazen Grid Mod." In the default connection scheme where the suppressor is tied to the cathode by a piece of wire bridging pin 1 to pin 8, there is no significant difference between EL34 and 6CA7 (or KT77.) Of course, different makes-models-samples will have different bias points (as Jim said) and maybe different sound as well, but they are all the same tube type except for the fact the beam tetrodes don't use pin 1 (they have an internal connection instead.)

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Follow Ups Full Thread

Topic - Is a 6CA7 essentially a heavy duty EL34? - AbeCollins 18:29:10 04/12/10 (4)

one difference - JJ Triode 20:04:18 04/12/10 (1)

RE: one difference - AbeCollins 11:15:52 04/13/10 (0)

RE: Is a 6CA7 essentially a heavy duty EL34? - Jim McShane 18:49:39 04/12/10 (1)

RE: Is a 6CA7 essentially a heavy duty EL34? - AbeCollins 20:02:11 04/12/10 (0)

Follow Ups

one difference - JJ Triode 20:04:18 04/12/10 (1)

RE: one difference - AbeCollins 11:15:52 04/13/10 (0)

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