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Old 27th February 2010, 03:42 AM   #11
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Hi
>>Do you know, how many special editions (or as you called "separate volume") are released at whole (like that one from post #4 and #5) ?

I do not Know so much ,too.
I research google or yahoo ,me too.
The "special editions" is say " 別冊"
So fill in the keyword (term) "無線と実験" , "別冊"

Sample of result.
"http://www.hifido.co.jp/KW/G7003/J/0-10/C09-39958-45443-60/"

AND
The Japanese National Diet Library
"http://porta.ndl.go.jp/portal/dt?action=content&provider=JSPTabContainer"
>>the keyword (term) "無線と実験" ,


P.S
I also participated in the DIY amplifier contest of the the 1000 anniversary.
2006_MJ_Amp_Contest

Regards!
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Old 28th February 2010, 11:42 AM   #12
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Thank you again for this advice - about the additional keyword " 別冊" I find a lot of the special editions (with cover pic and the title "Stereo Technic").

I think, the topology about
2006_MJ_Amp_Contest
is basicly the same than that descripted about there:
YouTube - 60W MOS FET DC Power Amplifier
Intro a circuit of study..

Very intersting. A challenge for me here it would be, to make a transition to a circlotron topology (CSPP = cross shunt push pull). If I have time, I will try it.

First advices therefore I have get about this thread:
Conversion of Hiraga's "Le Monstre" to a Circlotron

Last edited by tiefbassuebertr; 28th February 2010 at 11:50 AM.
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Old 28th February 2010, 01:11 PM   #13
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Hi !

> I think, the topology about
> 2006_MJ_Amp_Contest
> is basicly the same than that descripted about there:
> YouTube - 60W MOS FET DC Power Amplifier
> Intro a circuit of study..

Thank you, seeing my site and you tube

Well they basicaly same configuration that inverted and
complementary P-P, but the feedback architecture is different.

Especially
> YouTube - 60W MOS FET DC Power Amplifier
have 180dB at 1KHz openloop gain according to the simulation,
(However, though it is not a complete model)
and have stability,too.

The reason why I use inverted type,there isnot "the channel modulation effect" of FET (that is same effect "early effect" of transistor,
Even if using cascode , not enough.)

And not using the differential circuit,
the complementary circuit operate "differential" even if the
input signal and the feedbak signal become different
shapes of waves.
(differential circuit ,actually, is not to be operating...
under the above..)

Jean Hiraga's Le Monstre / Monster - DIY Class-A 8W Amplifier
Yes ,I know well it and think good .
It is non inverted and current feedback circuit.

Regards
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Old 1st March 2010, 06:19 PM   #14
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for better understanding I have create a simplified circuit of your amplifier topology (last of the collection from some other in the pdf attachement).

But I don't understanding in the moment your multiple NFB topology (perhaps I must try to create additional different sketching of the NFB resistor network). But I think, it is an special variation of an error correction topology.

This topology I have never seen before. The greatest similarity for me is to the electrocompaniet AW100 power amp circuit (see second attachement).

Do you know a commercial product, that uses similar topology?

Independent of this here the links about Yamaha's Hyperbolic Conversion Amplifier MX-10000:
Yamaha's Hyperbolic Conversion Amplification (HCA) Circuit

Last edited by tiefbassuebertr; 1st March 2010 at 06:24 PM.
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Old 1st March 2010, 06:23 PM   #15
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I have forget the power amp section for the AW-100
Attached Files
File Type: pdf C ...-A-Electrocompaniet Ampliwire 100.ckt.pdf (26.7 KB, 90 views)
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Old 2nd March 2010, 05:06 PM   #16
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Very Very thank you for thinking my amp circuit.

"2006_MJ_Amp_Contest" is just variation of an error correction topology as you say.

Electrocompaniet Amplifire 100 is inverted trans-impedance amp.
I think this is not current feedback circuit maybe...
The feedback point ( summing point) of the current feed back circuit is to be low impedance.

One of the information about standard current feedback circuit.
"http://ebyanmo.web.fc2.com/music/2002_08_16_opamp/index.html"
fig3 is current feedback model.

I think "60W MOS FET DC Power Amplifier" is inverted current feedback circuit... So it can get wide range band with high Open Loop gain easyly.

The explanation of working this amp is bellow ,may I help you.
http://www2.plala.or.jp/puthoff/mate...ork_081030.pdf
http://www2.plala.or.jp/puthoff/material/EXP_MK2_V2.pdf

Regards!
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Old 23rd June 2010, 07:14 PM   #17
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about follow URL there are listed many editions:
??????????????????????? (= http_soundpage.jugem_jp)
e. g.
????? 1968 | ???????????????????????

By recherche on the web about various "first solid state" amp devices from Victor (JVC)
I found this site, but unfortunately nothing else except this:
http://audio-heritage.jp/VICTOR/amp/mcp-200.html (Pre- Amp)
http://audio-heritage.jp/VICTOR/amp/mca-103.html (Integrated Amp)
http://audio-heritage.jp/VICTOR/amp/mca-103b.html
http://audio-heritage.jp/VICTOR/amp/mca-102.html
http://audio-heritage.jp/VICTOR/amp/mca-104.html
http://audio-heritage.jp/VICTOR/amp/ast-120t.html (Reveiver)
http://audio-heritage.jp/VICTOR/amp/ast-125t.html (Reveiver)
http://audio-heritage.jp/VICTOR/amp/mcm-200.html (Power Amp)
Obviously this devices was only sell in Japan

Last edited by tiefbassuebertr; 23rd June 2010 at 07:19 PM.
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Old 23rd October 2010, 02:35 PM   #18
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I still want to know all articles about solid state power amplifier topologies published in this MJ magazine.
Who knows, where I can get table of contents about the MJ Magazine online for download or as CD-ROM?
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Old 24th October 2010, 03:00 AM   #19
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Hi tiefbassuebertr

Though Only japanese site, can get index.

MJ無線と実験 - 無線と実験目次検索メニュー

Regards
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Old 6th December 2012, 06:23 PM   #20
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I am looking for an old test report of Linn's LP12 between 1972 and 1980 (Turntable/record player contest) in this magazine.
Perhaps one of the members from Japan can upload this - thank you very much therefore.

This or next year is the 40th anniversary of the LP12
When is the 40th anniversary of the LP12?
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