Phonovorstufe VP-2000, RIAA amp

[peranders]

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?

 

[halojoy]

2 OP amps
Instead of painting them
they have put on some labels

 

[yeti]

Music Amp 2000

Its a discrete Op-Amp, see

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

Arne

 

[yeti]

Here comes the datasheet

http://http://www.thel-audioworld.de/pics/ma3.gif

 

[yeti]

sorry

http://www.thel-audioworld.de/pics/ma3.gif

 

[halojoy]

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:

An externally hosted image should be here but it was not working when we last tested it.

 

[peranders]

Re: Music Amp 2000

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?

 

[EC8010]

Re: Re: Music Amp 2000

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.

 

[halojoy]

Deane Jenssen JE-990

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.

An externally hosted image should be here but it was not working when we last tested it.

JE-990

An externally hosted image should be here but it was not working when we last tested it.

Simple Discrete Op amp - symetric

And here is the 5532 "Headphone amp"