[AMRadio] 813 tx (EL-34 comment)

DOXEMF at aol.com DOXEMF at aol.com
Sun Nov 28 19:02:40 EST 2004

Hello Dennis,
>From working with many EL-34 based amps from Guitar to HIFI
I would have to agree with you. Just look at the cathode area
and size of the plates. While I don't have the technical reference to back me up, there's a direct correlation between
the size of the Plate/Cathode area and a nice sound. Higher peak current capability? Density? Who knows. I have yet to hear any small internal tube sound big and fat. Most noticeably with the later 12AX,U 7's. A NOS large plate,while supposedly the same parameter tube, sounds much "fatter" than a later,much shorter box plate. El-34's are known for their higher even harmonic distortion which is why they work so well on guiter. EL-84's in the same way have an even higher even harmonic level which makes amps using them sound way louder for the watts. Vox AC30 for examp.
I will have to try the EL34's in my VK 2 since direct driving the grids of the 807's with a UTC line to grid transformer of appropriate ratio and op level just doesn't quite cut it either. There's also the fact that the 807-6L6 family of tubes are beam power tubes and an EL34 is a real Pentode.

Wm. Courtright KB3DKS/1

More information about the AMRadio mailing list

This page last updated 22 Feb 2018.