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Old 12th October 2005, 04:13 AM   #1
bee696 is offline bee696  Thailand
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Question Audio Note M7 Line Preamp??

Heard that Audio Note M7 Line Preamp is using single 5687 for line stage + 6X4 tube rectifier....REAL??

But in this website (http://www.audionote.com.sg/products...p/kondo/m7.htm), it stated that it's using 12AX7WA x 2 (EQ) + 6072WA x 2 (LINE) + 6X4 ??

Anybody knows the "REAL" schematic?

THANKS!
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Old 12th October 2005, 07:24 AM   #2
docali is offline docali  Germany
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Hi,

see at the manufacturer's site:
http://www.audionote.co.jp/preamp/index.htm
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Old 12th October 2005, 10:45 AM   #3
bee696 is offline bee696  Thailand
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Just found this.....different versions of M7??



Click the image to open in full size.
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Old 12th October 2005, 11:47 AM   #4
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I have built this line stage and I'm sure many others here have followed suit. I built the 5687 version except I added gas regulators to the circuit. Its a good sounding circuit. Shortly after building it I built a 12B4 line stage that totally blew away the 5687. There are several versions of the 5687 line stage and both produce about the same result.
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Old 14th October 2005, 07:31 AM   #5
JPS is offline JPS  India
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I have made this circuit, sounds very fantastic. I think it is clone of
original circuit.

http://img401.imageshack.us/my.php?image=anm78od.jpg

Thanks

JPS
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Old 14th October 2005, 12:00 PM   #6
Previously: Kuei Yang Wang
 
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Default Re: Audio Note M7 Line Preamp??

Konnichiwa,

Quote:
Originally posted by bee696
Heard that Audio Note M7 Line Preamp is using single 5687 for line stage + 6X4 tube rectifier....REAL??
Yes, really.

You need to realise that Kondo has had several Models under the general "M7" designation.

The "Full preamp" always used a 6072A Linestage with a Voltage Amp/Cathode follower combo and a variety of Phonostages, first 6072A Cascode into passive RIAA into 6072A and now ECC83/12AX7 with NFB EQ.

The Line Preamp originally used a single 5687 common cathode with the Output directly from the Anode, the current Linestage model is different from that.

For fun, the first Kondo "M7" actually used Mosfets, very special ones, not many where ever made...

Quote:
Originally posted by bee696
But in this website (http://www.audionote.com.sg/products...p/kondo/m7.htm), it stated that it's using 12AX7WA x 2 (EQ) + 6072WA x 2 (LINE) + 6X4 ??
This website refers to the current M7 MKII KSL and the full function model.

Sayonara
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Old 14th October 2005, 12:34 PM   #7
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I have made this circuit, sounds very fantastic. I think it is clone of
original circuit.

http://img401.imageshack.us/my.php?image=anm78od.jpg

Thanks

JPS

JPS,

This board is available from kitparts. Everything they have is supposed to be a clone of an original circuit. Nothing could be further from the truth. I have two examples of their work sitting on my bench in the garage. While workable as a line stage not even close to the original. In my opinion not worth the money.
Mine are supposed to be Jadis and like I said not even close.
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Old 14th October 2005, 12:45 PM   #8
Previously: Kuei Yang Wang
 
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Konnichiwa,

Quote:
Originally posted by JPS
I have made this circuit, sounds very fantastic. I think it is clone of original circuit.

Click the image to open in full size.

Surprisingly this circuit is practically exactly that of the linestage of the full function Kondo M7, including the paralelling of unequal value cathode resistors, except for the most important part, the valve. This should be a 6072A, NOT 12AU7.

Also, Kondo builds the circuit hardwired, on copper chassis and using his own Silverfoil & Mylar capacitors plus tantalum resistors....

Sayonara
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Old 14th October 2005, 02:01 PM   #9
JPS is offline JPS  India
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Hi burndfingers

I had made the PCB myself. My preamp sound is excellent.
Thou I have not listened to many world famous preamps but
a friend of mine who has listened to lot of preamps said this one is top class. Simple and best.

regards

JPS
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Old 21st October 2005, 10:47 AM   #10
JPS is offline JPS  India
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http://img401.imageshack.us/my.php?image=anm78od.jpg


Hi
Is there any octal version of this circuit using 6SN7 or 6SL7 ?

Regards
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