help converting conrad johnson MV-55 into triode! - 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 19th June 2004, 09:21 AM   #1
nikos is offline nikos  Greece
diyAudio Member
 
Join Date: Jun 2004
Location: Athens
Default help converting conrad johnson MV-55 into triode!

Does anyone have any idea of how to convert conrad johnson's MV 55 into triode operation mode?The amplifier was offered in both ultralinear and triode configurations.
  Reply With Quote
Old 19th June 2004, 01:05 PM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
In UL, the screen grids are connected to taps on the O/P trafos. Disconnect the leads connecting the screen grids to the trafos at the tube sockets. THOROUGHLY insulate the ends of the disconnected leads and tuck them away neatly. Connect the screen grids to the plates at the sockets via 5 W. 100 Ohm resistors.
__________________
Eli D.
  Reply With Quote
Old 19th June 2004, 01:42 PM   #3
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
 
dhaen's Avatar
 
Join Date: Jun 2002
Location: U.K.
I have one on the bench for repair, so I've taken a picture.
In the picture you can see the output transformer wires connect to the PCB.
The blue wire is the anode (plate)
The green wire is the screen (G2)
There is a link that should be easy to pull out and re-plug, but on this one it's been soldered in. If yours is soldered, I'd recommend just cutting it, else the PCB might get damaged.
What you have got to aim at, is to make the link horizontal, thus isolating the green wire that goes to the primary tap, and connecting together the anode and screen grid.
There are 4 to do, each near the PCB corners.
Attached Images
File Type: jpg img_3460a.jpg (19.3 KB, 180 views)
  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
Conrad Johnson Premier 10 Freddie Tubes / Valves 2 19th March 2013 08:45 AM
Conrad Johnson Premier 350 Tube_Dude Solid State 0 30th January 2009 06:49 PM
Conrad Johnson Sonographe SA-250 crossroads Swap Meet 1 3rd February 2008 07:40 AM
Conrad Johnson PV 7 problem Peppe Tubes / Valves 8 8th November 2006 08:37 AM
conrad johnson help efoda Tubes / Valves 3 24th January 2002 03:23 AM


New To Site? Need Help?

All times are GMT. The time now is 04:23 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