Yamaha B-4 Experience. - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 28th July 2002, 07:28 AM   #1
diyAudio Member
mrfeedback's Avatar
Join Date: Feb 2002
Location: Perth, Australia.
Default Yamaha B-4 Experience.

In the eighties Yamaha produced three amplifier models (B-4, CA-S1, CA-R11) that featured an ' Ro Control'.
This control allowed adjustment of output impedence from + 1 ohm through 0 through - 1 ohm.
I am presently studying an old factory tutorial manual and this gives the argument that with this circuit the amplifier op and cable impedences and driver resonance can be eliminated and in so doing provide better damping of the load driver.
Does anybody have experience of these amplifiers, and in particular critiques of the usefulness of the 'Ro Control' ?.

Thanks, Eric.
  Reply With Quote
Old 28th July 2002, 07:32 AM   #2
diyAudio Member
mrfeedback's Avatar
Join Date: Feb 2002
Location: Perth, Australia.
This is the tutorial example circuit.
Attached Images
File Type: jpg yamaha b4.jpg (23.7 KB, 338 views)
  Reply With Quote
Old 28th July 2002, 01:55 PM   #3
tvi is offline tvi  Australia
diyAudio Member
tvi's Avatar
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
You might find the folloowing Yamaha Patents of interest

<a href=" Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN %2F4908870">Motional load driver</a>

<a href="'5206912'.WKU.&OS=PN/5206912&RS=PN/5206912">Power amplifier adapter</a>

You will need a tiff viewer, I use a plug-in:- <a href="http://www.alternatiff.com">alternatiff.com</a>

  Reply With Quote
Old 29th July 2002, 01:48 AM   #4
diyAudio Member
mrfeedback's Avatar
Join Date: Feb 2002
Location: Perth, Australia.
Tvi, Thanks for the patent links - I'll take a closer look tonight.
Anybody have listening impressions ?.

Regards, Eric.
  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
A.O.S - Any experience? Keltern Multi-Way 16 26th April 2012 11:15 PM
my t-amp experience Eggzy Chip Amps 35 17th December 2005 06:29 PM
anyone experience with this amp? Hanzwillem Solid State 1 31st October 2003 05:46 PM
Anyone experience with TSM-300 ? till Multi-Way 2 24th September 2002 07:50 PM

New To Site? Need Help?

All times are GMT. The time now is 05:54 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