Hello Folks,
I got the chance to take a look to a Accuphase AD-9 PCB ( Phono preamp module ) before usage. So I would like to see how the "High-End" boil thier water...
Attached you can find a schematic get from PCB wiring. A few values are missing ( Zehner diodes ) and power supply voltage but it may be interesting for you.
!Have in mind, that it is possible that I do mistakes!
Have a nice week,
best regards
Karsten
I got the chance to take a look to a Accuphase AD-9 PCB ( Phono preamp module ) before usage. So I would like to see how the "High-End" boil thier water...
Attached you can find a schematic get from PCB wiring. A few values are missing ( Zehner diodes ) and power supply voltage but it may be interesting for you.
!Have in mind, that it is possible that I do mistakes!
Have a nice week,
best regards
Karsten
Attachments
Тhank you so much for your effort!
Very disappointing "high end"... seen much better in mid fi jap amps.
Very disappointing "high end"... seen much better in mid fi jap amps.
At least it doesn't use 7815/7915 and 5532. And as the opamp and the supply is the determinant factors in this circuit, which mid-fi is better than these?
Hello,
We should not forget, that the development of the AD-9 Phono module may several years ago. Today it is more wise to use an LT1115 or similar and a nice little Op-Amp for DC-servo.
But I often heard, that some "magic" is inside discrete setups. I never understand this personaly; all the thermal issues as well as the accurate selection of the FET/Transistors used for the differentional amplifier will lead you in lot of problems and.. is more expensive as an integrated version.
Regards
Karsten
We should not forget, that the development of the AD-9 Phono module may several years ago. Today it is more wise to use an LT1115 or similar and a nice little Op-Amp for DC-servo.
But I often heard, that some "magic" is inside discrete setups. I never understand this personaly; all the thermal issues as well as the accurate selection of the FET/Transistors used for the differentional amplifier will lead you in lot of problems and.. is more expensive as an integrated version.
Regards
Karsten
So this non Audiophile Company uses some of the best jfets and bipolars ever made .
Cool
Akai if that adds insult to injury 😎
Apparently it can be found used for less than lunch
Akai AM-A70 - opinions? | Audiokarma Home Audio Stereo Discussion Forums
By the way, power amp section is also rather interesting there - input stage topology, NFB arrangement - very cool 😎
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