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Old 24th April 2006, 12:59 PM   #1
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Default kenwood C2 + M2A

Hi,

I'm looking for the schematics of kenwood basic c2 preamp and basic m2 amp.

it would be great if someone could give it to me.

Thanks !
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Old 19th February 2007, 09:53 AM   #2
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Default see other problemcase

Hi,

i've red an other problemcase in this forum searching 'kenwood basic m2' and i found a message that member dan mattis wrote he has some documents about m2....

try to mail him...
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Old 19th February 2007, 01:56 PM   #3
K-amps is offline K-amps  United States
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Dan's the M2 expert .
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Old 20th February 2007, 12:46 AM   #4
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try http://www.eserviceinfo.com/
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Old 20th February 2007, 07:56 AM   #5
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Default further searching m2/c2 documents

Hi,

thanks to member k-amps and leolabs.
I've searched but i've found unfornately nothing useable....

k-amps is dan (the m2/c2 expert) the member dan mattis?

anybody else an idea where i can find...?
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Old 20th February 2007, 01:57 PM   #6
K-amps is offline K-amps  United States
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Yes Dan Mattis. I replied to your emails but they bounced back undelivered.

I have done the ta2031 bypass however, found that the heatsink was woefully inadequate. Bypassing the 2031 makes the amp a regular class-B from the class-G that it is. With the OP's getting the full 91v rail blast.... they heat up quick and the heatsink goes over 80c pretty quick and the OP's go kaput. I tried a1943/c5200's.

I ran them from the drivers A1006?? I forget... via 20R base resistors. Before they overheated, the sound was just awesome... though I was driving a 2 ohm load

One workable solution is to replace DAT's with the 2sa1943/2sc5200 or equivalent devices (+200vce) to save the cost of blown DAT's however the ta-2031 must remain for the topology to remain viable.
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Old 20th February 2007, 08:30 PM   #7
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Default Kenwood M2A schematics

Hi to all members
I have uploaded the schematic of this amp(and also the Yamaha M-70)on the site

http://fileshare.eshop.bg/

Search for M2A (kenwood) and M-70 (Yamaha)

Salut apolon34.
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Old 22nd February 2007, 02:57 PM   #8
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Default kenwood m2(a).....

Hi,

and thank you very much parsecaudio, the searchkey was 'm2a'.
Fine documents ;-) thanks again. certain very usefull for m2(a) fans....

Hi,

k-amps also many thanks to you. maybe problems with the emailprovider to much spam or somethingelse; its only technic it works or doesn't......
Thanks also for you tips. You have saved the life of some DATs, because you have tested this methode, so i don't need to test it.

Has the replacement of the DATs with the 2sa1943/2sc5200 large effects to the sound? Have you done it?

And another thing, for the m2 i will need some new speaker.
I prefer a grundig audiorama ball system its sond is brilliant, but its power to less for the m2 by far.
Have you some ideas of useable speaker? But please not to expensive, i only have some m2 and not an accuphase, burmester or McIntosh. only a small budget....

another thanks for your helpful infos ;-)
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Old 22nd February 2007, 03:18 PM   #9
K-amps is offline K-amps  United States
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Any speaker with the M2(a) is fine though it prefers 8 ohm speakers.

I have tried 1302/1943 etc and they work fine. I even tried them paralell with the DAT and they worked fine.

However I'd suggest to use them for hi-volt or low volt OP stage, not mix and match toshiba with DAT.

The die on the DAT's looks like dual 130 watt BJT's... so you could substitute an ON type 250 watter or 200 watter instead of one DAT.

I have been able to fit 2 tos per dat on the heatsink and it works too... but my was to drive 4 ohms speakers. If you want to save on cost/ expense, use 1 1302 class BJT per DAT.
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