mu followers --- current --- please help - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Old 20th October 2007, 10:06 PM   #1
diyAudio Member
soundbadger's Avatar
Join Date: Sep 2007
Question mu followers --- current --- please help

i have designed a mu follower circuit based on the one in morgan jones valve amps book,,, just wondering what the current drawn by a mu follower is.. also how do i work out what power rating resistors to use ,,

  Reply With Quote
Old 20th October 2007, 11:21 PM   #2
diyAudio Member
Miles Prower's Avatar
Join Date: May 2005
Location: USA
Blog Entries: 7
Ina word, Loadlines (See under "Technocal Reports"; he has a five-parter that tells all about it.)
There are no foxes in atheistholes
  Reply With Quote
Old 21st October 2007, 01:09 AM   #3
diyAudio Moderator Emeritus
ray_moth's Avatar
Join Date: Jan 2004
Location: Jakarta
Miles's link didn't work for me but I think he meant that the operating point needs to be chosen according the the plate curves. The load line itself will be almost horizontal b ecause of the high impedance that the mu-follower provides as a plate load to the lower tube. However, you still need to select an operating current based on the tube's characteristics. A rule-of-thumb approach is probably good enough here, i.e. use a high enough current for linear performance but don't go for too much plate dissipation.
  Reply With Quote
Old 21st October 2007, 03:54 PM   #4
pftrvlr is offline pftrvlr  United States
diyAudio Member
Join Date: Feb 2007
Location: SoCal
I am building one mu-follower as headphone amp - with extra 6bx7 output cf stage. I use SPICE to set the operating point and check component power rating. Works fine for me.
  Reply With Quote
Old 21st October 2007, 04:39 PM   #5
Jeb-D. is offline Jeb-D.  United States
diyAudio Member
Jeb-D.'s Avatar
Join Date: Nov 2005
Location: SoCal
Speaking of Spice. Soundbadger, your icon looks like it's from circuitmaker. I use the student edition which I got while in school. If that is what you have, I figured out to alter the model folder so that you can add more tubes to the library. I'll let you in on the trick if that's what you use.
  Reply With Quote
Old 24th October 2007, 07:46 AM   #6
diyAudio Member
soundbadger's Avatar
Join Date: Sep 2007
ive not used spice before, at college we use ewb multisim which is a bit limited. i just got a copy of pspice so ill see how i get on. i
  Reply With Quote


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
Feedback and mu-followers mark_titano Tubes / Valves 2 14th August 2005 09:51 AM
Mu Followers -- ressources? Onvinyl Tubes / Valves 3 3rd March 2005 01:34 PM
beta followers baggystevo82 Tubes / Valves 16 23rd June 2004 12:05 AM
Zen-V with followers nobody special Pass Labs 23 20th July 2003 07:24 PM

New To Site? Need Help?

All times are GMT. The time now is 04:30 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2