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Old 13th June 2011, 09:14 AM   #1
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Default Yamamoto A-09s

Hi

I'm looking for the manual/schematics for Yamamotos A-09s C3m/300b amp.
Do someone know where I can get a copy ?

Best Regards
Fonnesbek
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Old 13th June 2011, 09:58 AM   #2
euro21 is offline euro21  Hungary
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Schematic
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File Type: jpg Yamamoto A-09S.jpg (92.4 KB, 1134 views)
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Old 13th June 2011, 10:27 AM   #3
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Great thanks, but do you also have the power supply schematics ?
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Old 13th June 2011, 11:10 AM   #4
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Probably somewhat like this..
http://upload.review33.com/images/20...1227448114.jpg
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Old 13th June 2011, 12:15 PM   #5
euro21 is offline euro21  Hungary
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Reverse engineering this photo:
http://www.6moons.com/audioreviews/y...2_open_big.jpg
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File Type: jpg Yamamoto A09S schem 2.jpg (50.9 KB, 966 views)
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Old 21st November 2012, 06:28 PM   #6
dinoc is offline dinoc  United States
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Do you guys knows the power transformer output voltage and current, thanks a lot.

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Old 21st November 2012, 09:18 PM   #7
Ejam is offline Ejam  Australia
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Default C3M current

Guys

I have got to say that running the C3M at 2mA with a 110k load is an odd choice (typically Japanese DIY crazy "do something different"), given the capabilities of this tube. I have tried the opposite and ran 16mA into a 12k load, great sound and handles anything the 300b throws at it with ease. Still each to his own.
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Old 21st November 2012, 10:26 PM   #8
Jogi is offline Jogi  Germany
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These were exactly my thoughts when looking at this schematic. With 2mA one could stay with the usual 6sl7 stuff, and the screen voltage is similar strange.
I used the same as you, 12k load with 16mA, 150V at the screen, and the 300B starts to rock, no ploddy bass anymore, balanced throughout the spectrum.
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Old 22nd November 2012, 03:07 AM   #9
dinoc is offline dinoc  United States
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Does it mean that change the 33K on G2 to 12K, and also change the zener voltage to 150V ? thanks

Last edited by dinoc; 22nd November 2012 at 03:29 AM.
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Old 22nd November 2012, 04:30 AM   #10
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Quote:
Originally Posted by Ejam View Post
Guys

I have got to say that running the C3M at 2mA with a 110k load is an odd choice (typically Japanese DIY crazy "do something different"), given the capabilities of this tube. I have tried the opposite and ran 16mA into a 12k load, great sound and handles anything the 300b throws at it with ease. Still each to his own.
in pentode mode?
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