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Old 28th July 2002, 08:28 AM   #1
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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.
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Old 28th July 2002, 08:32 AM   #2
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This is the tutorial example circuit.
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File Type: jpg yamaha b4.jpg (23.7 KB, 325 views)
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Old 28th July 2002, 02:55 PM   #3
tvi is offline tvi  Australia
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You might find the folloowing Yamaha Patents of interest

<a href="http://164.195.100.11/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2 Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN %2F4908870">Motional load driver</a>

<a href="http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='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>

Regards
James
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Old 29th July 2002, 02:48 AM   #4
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Tvi, Thanks for the patent links - I'll take a closer look tonight.
Anybody have listening impressions ?.

Regards, Eric.
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