|Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
||Thread Tools||Search this Thread|
|14th October 2010, 02:08 PM||#31|
Join Date: Nov 2007
Papers are papers. I own this tube and prove w. XRay photos.
Regardless RCA theory of operations may teach us otherwise:
Grids in that particular RCA weirdo were NOT wound of similar
pitch. Not even related by an integer multiple...
I suspect to have curves more similar to real 6BQ5 pentode
there may have been no choice but the pitch RCA abused?
This was RCA attempt to clone a popular valve and evade a
patent, not to design a new theoretically ideal beam tetrode
Say one thing, but do another. Some "rules" got bent...
I've also peeked inside plenty of true pentodes that had
excellent gird screen alignment, regardless there was no
beam former (and no special alignment of the supressor).
What defines "beam power"? A former, or G1's shadow?
These are two entirely separate effects that happen to
work well together. But makes naming things that only
use one or the other a job for salesmen.
Last edited by kenpeter; 14th October 2010 at 02:31 PM.
|14th October 2010, 02:15 PM||#32|
diyAudio Chief Moderator
They had the EL84 from Philips, measured it, and then homed in a beam tetrode equivalent most likely. Those guys could make anything thermionic to their measure. Godfathers of vacuum. Their EL34 equivalent 6CA7 works very well in some amps, even better than a suppressor grid EL34.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|EL84 PP output transformer for 6L6 PP class A||engels||Tubes / Valves||8||30th May 2007 09:45 AM|
|Which do you prefer - EL84 UL PP or EL34 Triode PP - and why?||ray_moth||Tubes / Valves||4||23rd February 2007 12:22 PM|
|PP-Triode , PP-UL , PP-Pentode-strapped-as-Triode||percy||Tubes / Valves||23||22nd January 2007 12:36 AM|
|6V6 vs EL84 SE UL||AudioGeek||Tubes / Valves||10||3rd February 2006 11:05 AM|
|New To Site?||Need Help?|