EL34 Hickok 439B setup - 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 18th December 2010, 06:42 PM   #1
diyAudio Member
 
Join Date: Jun 2006
Location: Whittier (greater Los Angeles area)
Default EL34 Hickok 439B setup

Hi Guys and Gals,

I recently bought a very nice pair VTL MB-225T.

I have some new Svetlana, and used Tesla EL34's

My tube roll chart (spring 1972) in my Roger Kennedy modified and calibrated Hickok 439B does not have the EL34 listed.

It does have the KT88, and the KT66. I "think" the KT66 is somewhat close to and EL34 electrically, so I am using those settings for testing.

But, I know those are not the correct settings.

I don't suppose anyone out there in cyberland could give me the correct settings, could you?


Thanks for any reply.

Bruce
  Reply With Quote
Old 18th December 2010, 06:57 PM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
See if the 6CA7 is listed which is the U.S. equivalent for the EL34.. Is that actually a 539B, if so I might be able to provide the proper settings at some point..
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 18th December 2010, 07:17 PM   #3
diyAudio Member
 
Join Date: Jun 2006
Location: Whittier (greater Los Angeles area)
Kevin, thanks.

That was simple. The only setting difference was a bias increase from 3.0 to 5.5.

Yes, it is a Hickok 439B, with SS regulation, and digital meters.

Kevin, and others. I have two other questions, OK three.

1) Which is more important to match on output tubes, Gm, or DC plate current?

2) When a tube "fails" is it likely it will take another tube with it?

3) Does anyone know, in a VTL/Manley 8 output tube monoblock, are the four tubes to one side (left), one phase, and the four on the opposite side (right) the other phase of a push pull.

Thanks again to all who have more knowledge and experience than I.

Bruce

Last edited by Bruce_weiland; 18th December 2010 at 07:26 PM. Reason: added comment
  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
Hickok 605 kroeber38 Tubes / Valves 7 1st January 2011 04:52 AM
Anyone Have a Hickok 800A skidave Tubes / Valves 6 22nd December 2008 02:30 PM
Hickok Upgrades Zero Cool Tubes / Valves 0 22nd June 2008 11:36 PM
Hickok 533A help cwujek Tubes / Valves 4 20th July 2007 12:09 PM
El34 PP Vs. El34 PSE alexmoose Tubes / Valves 47 6th September 2006 05:44 PM


New To Site? Need Help?

All times are GMT. The time now is 10:20 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