| Phonovorstufe VP-2000, RIAA amp - Click HERE for Original Thread |
| 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 :yes:
Have you checked the monster at the bottom? |
|
|
| halojoy |
2 OP amps
Instead of painting them
they have put on some labels |
|
|
| 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? |
|
|
| EC8010 |
| 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. |
|
|
| halojoy |
| 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.
JE-990
Simple Discrete Op amp - symetric
And here is the 5532 "Headphone amp" |
|
|
|
|
