Please help identify AN PCB

Cobra2 · 7th August 2011, 10:37 PM

I was told ths was an old RIAA circuit from Audio Note...but they(AN) will not supply schematic.
I would love if anybody cold help with more information...

Arne K

Cobra2 · 7th August 2011, 10:40 PM

Another picture:

Cobra2 · 7th August 2011, 10:43 PM

Under

mickeymoose · 8th August 2011, 08:59 PM

This thing is odd. Not likely an RIAA (I cant see the deempahsis parts). You have 2 tube sockets (not necessaryly for tubes though) and 3 xformers, 4th one bridged out. The size of the xformers indicates that they are propably input transformers. What is the part# on the TO220 on wires?
All in all, there are such few parts that Mr. Retroengineer should be able to tell you in an hour! E

limono · 8th August 2011, 09:55 PM

It is most likely transformer I/V and Srpp output stage for production AN DAC or CD player. The same board and 4 transformers were used in costly Dac 4.1.
Regards, L

Cobra2 · 8th August 2011, 10:15 PM

BD909
------------------
The answer from AN: (asked for model-no, info & schematic)
The board you have is an old phonostage, from a late 90s preamplifier.
Unfortunately we do not provide schematics for any of our products.
If I can be of further assistance, please let me know, we are always here to help.
Regards
M--- G----.
Audio Note (UK).
-----------------------
Arne K

Nanook · 9th August 2011, 12:02 AM

then maybe I could draw out a schematic for you.

limono · 9th August 2011, 02:59 PM

It looks similar

kevinkr · 9th August 2011, 04:42 PM

RIAA EQ is LCR based as far as I can tell..

limono · 9th August 2011, 06:23 PM

One stage (srpp) phono corrector??? I still think it's a dac output stage and AN rep sent you an incorrect info

8th August 2011, 10:15 PM	#6
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	BD909 ------------------ The answer from AN: (asked for model-no, info & schematic) The board you have is an old phonostage, from a late 90s preamplifier. Unfortunately we do not provide schematics for any of our products. If I can be of further assistance, please let me know, we are always here to help. Regards M--- G----. Audio Note (UK). ----------------------- Arne K __________________ Ars longa, vita brevis

9th August 2011, 12:02 AM	#7
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	Cobra, take a close-up of the reverse side... then maybe I could draw out a schematic for you. __________________ stew ☮ -"A sane man in an insane world appears insane."

9th August 2011, 04:42 PM	#9
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	RIAA EQ is LCR based as far as I can tell.. __________________ www.kta-hifi.net

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8th August 2011, 08:59 PM	#4
mickeymoose diyAudio Member Join Date: Nov 2008	This thing is odd. Not likely an RIAA (I cant see the deempahsis parts). You have 2 tube sockets (not necessaryly for tubes though) and 3 xformers, 4th one bridged out. The size of the xformers indicates that they are propably input transformers. What is the part# on the TO220 on wires? All in all, there are such few parts that Mr. Retroengineer should be able to tell you in an hour! E

8th August 2011, 09:55 PM	#5
limono diyAudio Member Join Date: Mar 2007	It is most likely transformer I/V and Srpp output stage for production AN DAC or CD player. The same board and 4 transformers were used in costly Dac 4.1. Regards, L

9th August 2011, 06:23 PM	#10
limono diyAudio Member Join Date: Mar 2007	One stage (srpp) phono corrector??? I still think it's a dac output stage and AN rep sent you an incorrect info

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