4 x EL84 in UL PP, 470 B+!! is this right - Page 4 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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
Reply
 
Thread Tools Search this Thread
Old 14th October 2010, 02:08 PM   #31
diyAudio Member
 
Join Date: Nov 2007
Location: Dallas
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
from scratch...

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.
  Reply With Quote
Old 14th October 2010, 02:15 PM   #32
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
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.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
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?

All times are GMT. The time now is 06:55 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2