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Old 21st January 2003, 12:18 PM   #1
Electrons are yellow and more is better!
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Default Phonovorstufe VP-2000, RIAA amp

Hi!

I got kind of interested in Phonovorstufe VP-2000. Anybody who knows what's inside the "black box". Schematics?
http://www.thel-audioworld.de/module/phono/phono.htm

Some of the Thiel stuff is very nice looking

Have you checked the monster at the bottom?
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Old 21st January 2003, 12:27 PM   #2
halojoy is offline halojoy  Sweden
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2 OP amps
Instead of painting them
they have put on some labels
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Old 21st January 2003, 12:30 PM   #3
yeti is offline yeti  Germany
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Default Music Amp 2000

Its a discrete Op-Amp, see

http://www.thel-audioworld.de/bauteile/bauteile.htm

Arne
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Old 21st January 2003, 12:36 PM   #4
yeti is offline yeti  Germany
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Default Here comes the datasheet

http://http://www.thel-audioworld.de/pics/ma3.gif
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Old 21st January 2003, 12:37 PM   #5
yeti is offline yeti  Germany
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Default sorry

http://www.thel-audioworld.de/pics/ma3.gif
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Old 21st January 2003, 12:38 PM   #6
halojoy is offline halojoy  Sweden
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Hier bist ein beschreibung in Deutsches

Can use upto +-55 Vdc

Here is a desciption in German:
http://www.thel-audioworld.de/pics/ma1.gif

On this page you have picture of the of module alone:
http://www.thel-audioworld.de/bauteile/bauteile.htm
down at right:

This is the princip:
Click the image to open in full size.
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Old 21st January 2003, 12:42 PM   #7
Electrons are yellow and more is better!
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Default Re: Music Amp 2000

Quote:
Originally posted by yeti
Its a discrete Op-Amp, see

http://www.thel-audioworld.de/bauteile/bauteile.htm
OK, thanks. I was convinced that the "black box" wasn't for sale. I guess the inside is diff input stage with possible cascode in the high gain stage. Anybody who has more info? FET's as input stage?
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Old 22nd January 2003, 02:16 AM   #8
EC8010 is offline EC8010  United Kingdom
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Default Re: Re: Music Amp 2000

Quote:
Originally posted by peranders


OK, thanks. I was convinced that the "black box" wasn't for sale. I guess the inside is diff input stage with possible cascode in the high gain stage. Anybody who has more info? FET's as input stage?
Just a thought, but is it the Deane Jensen 990 op-amp that was published with circuit diagram in the Journal of the Audio Engineering Society? Before anyone asks, the reason I haven't given a specific reference is that my AES CD-ROM couldn't find it even though I know I have seen the paper copy.
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Old 22nd January 2003, 04:23 AM   #9
halojoy is offline halojoy  Sweden
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Arrow Deane Jenssen JE-990

Quote:
Originally posted by EC8010
Just a thought, but is it the Deane Jensen 990 op-amp that was published with circuit diagram in the Journal of the Audio Engineering Society?
Here I found JE-990 Discrete OP-amp
and a symetric "simple OP"
along with some other circuits, GIF/PDF
on this page:

Dave Baldwin is DIBs Electronic Design, providing design support for Audio

There is a AUDIO BUFFER - 5532-OP using PUSH-PULL output stage.
Can be studied/modified.
This princip Can with good results be Used as
a DIY-HeadPhone Amp.
Several designs with different OP-amps, has proven this.

Click the image to open in full size.
JE-990

Click the image to open in full size.
Simple Discrete Op amp - symetric

And here is the 5532 "Headphone amp"
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File Type: gif 5532transistor buffer.gif (7.2 KB, 258 views)
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