Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

EL34 vs 6L6 for HiFi
EL34 vs 6L6 for HiFi
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
Old 19th April 2020, 12:18 AM   #41
PRR is online now PRR  United States
diyAudio Member
PRR's Avatar
Join Date: Jun 2003
Location: Maine USA
EL34 vs 6L6 for HiFi
> Philips claims otherwise (source:....

NOTE: this is an 80 megabyte file, all in Dutch. Very good book with much about EL34. Only one sample for 6L6 and that is a class B2 (grid current) example, not really about "linear".
  Reply With Quote
Old 19th April 2020, 03:55 PM   #42
nauta is offline nauta  Canada
diyAudio Member
Join Date: Sep 2017
I never said RCA invented beam tubes - just their implementation of using plates rather than critically aligned grids as Mullard did made the RCA tube a better tube with less distortion.

In simulations, UL shows a compression effect with greater input drive. I found this surprising since it goes against the name of the connection and how it has always been presented. In a guitar amp, open-loop UL sounds the best and likely part of it is this compression, but more the fact of the reduced Z-out from U - not as dark and floppy as open-loop tetrode/pentode mode.

In my experience, I found a distinct sonic difference between the two groups of tubes based on screen structure, as my previous post stated. Your experience may be different. From what THD measurements I can make, the beam-forming plate group exhibited lower THD in the same circuit compared to any grid-screen tube. You may want to argue that the OT Ra "was not optimal" for all the tubes? But that is not really an issue. The tubes were driven to only 1W of output in what was a 60W circuit. All the tubes work well with the same range of OTs over a wide range of supply environments and in this case,m the values were all very middle of the road.

When you listen to a neutral sound and then a bright one, you will generally prefer the bright one - i is a quirk of our brains or physiology. The brighter sound I believe requires a bit more processing in our brains and once we have made that shift we are "EQed" in a way for brighter sounds just at that moment. Going back to the neutral sound will give the impression that 'neutral' has become 'dull' or 'lacking in treble'. For this reason, it is difficult to make side-by-side comparisons of sounds for whatever the purpose may be.
  Reply With Quote
Old 22nd April 2020, 02:01 PM   #43
Kay Pirinha is offline Kay Pirinha  Germany
diyAudio Member
Kay Pirinha's Avatar
Join Date: Oct 2011
Location: Somewhere in Germany
Beam valves also are pentodes due to their five electrodes. The Inventor(s) choose to name them beam tetrodes just to avoid infringements with the pentode patent held by Philips.
And no, the Russian 6P3S-E is no 6L6GC!
Best regards!
"I spent a lot of money on booze, birds and fast cars. The rest I just squandered." (George Best)
  Reply With Quote


EL34 vs 6L6 for HiFiHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need HELP on Randall RGT100ES 6L6 to EL34 valdio Instruments and Amps 1 4th May 2010 05:45 PM
How do I change this design from EL34 to 6L6? MellowTone Tubes / Valves 14 8th December 2009 10:48 AM
6L6 to EL34 conversion bereanbill Tubes / Valves 3 11th February 2009 04:55 PM
EL34 or 6L6 mono help me please!! mrnedrub Tubes / Valves 0 15th January 2007 12:59 PM
6L6 vs EL34 resident Tubes / Valves 20 13th October 2004 06:37 AM

New To Site? Need Help?

All times are GMT. The time now is 09:23 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio