I just SCORED!

[Elk Latham]

When I was a intern in the early 90's at the Music Annex, I use to drive by that sign every day.
I hope they never bring it down!!!!

Elk

 

[volki]

rafa, interesting module. you said it's by siemens? which one is it (type no.)? looks like a distribution amp to me.

i just got two of those TAB/telefunken V382 distribution amps, with 1 i/p and 6 o/p trannie's each. somewhat smaller in size than yours, these only measure like 15db headroom, but with a real world signal i can drive them hotter than that, without even noticing any "coloration" really...

 

[rafafredd]

Yes, mine is a siemens one. It´s a 1:6 distribution amo.

What is used as a buffer in yours?

 

[volki]

discrete class a, 60's style =)
this is one of the few amp modules where even silent arts can't seem to find schematics to! - 4 transistors per channel, i suppose it's something like 2 t's driver and 1 t o/p stage with active emitter load. the usual topology to be found in all the 60's siemens o/p drivers.

what's the type / number of the whole module cassette you got?

 

[rafafredd]

I think the closest thing to a module number in there is PM-VV.

It´s also writen C98409-D9211-A1 and LM/W/837055 (look like a part number)...

Thanks for asking this. It made me look better at my own module and it says:

6Ausg.+15dBm/24v.

So, this thing runs at 24v. I thought it was +-18... I still think its +-24v. Yeah, for sure, based on the schems.

I hope it can go higher than +15dBm, thought. It´s kind of low for driving most proaudio and vintage gear. For digital, I think it´s OK.

By the way, CJ, this AMPEX sign looks very nice!

 

[volki]

rafa, 24v will certainly mean *uni-polar* supply. can't think of any siemens design with that high a bi-polar voltage.

like i wrote, my v382's are rated +15 dbm max, too, but the trannies can take a hotter signal IMO. have you checked with yours? the normal german broadcast stuff is +22, but probably the distribution amp's were used for special applications which allowed for less headroom. anyway, i'm gonna use my trannies to drive digital bal. in's, too, so that's fine i guess.

 

[rafafredd]

Thanks. I´ll try to trace all the module... It really looks it´s single supply. The maximum opamp voltage is +-18v, so...

Maybe I´ll try to run the separate buffers at +-18v for higher headroom.

As I said, I´m taking the modules appart and will use the buffers and trasformers in diferent projects.

I often get impressed by all the diferent types of modules those German companies produced over the years. Lots of diferent stuff.

 

[Guest]

[quote author="rafafredd"]http://hps.infolink.com.br/rafafredd/siemens_schem.gif
[/quote]
May be better to connect end of R1 directly to output
(after transistors, R7). It can lower follower distortion.
C1 connection is correct.
xvlk

 

[rafafredd]

I´ll try this. Thanks!

 

[nacho459]

[quote author="cjenrick"]Speaking of Ampex, the old sign from the fifties is still up on highway 101 near Redwood City:[/quote]

Hmm, when did they leave Redwood City? Wasn't it in the 80s? Is Ampex still around, just not in the tape industry (like BASF) if so, maybe they still use the building?

 

[pucho812]

to the best of my memory, Ampex has been R.I.P. for quite some time now. I don't remember when but I do remember they were bought/turned into quantagy. AS for the sign it's definately worth getting it's a nice piece of history. Could it be bought? And speaking of History The famous Cello studios now has a new owner and if I remember the artical in pro sound news, they are renaming it Western Recorders.

 

[jrmintz]

Ampex spun off the tape division as Quantegy and now is called Ampex Data Systems. They do acquisition and storage for imaging, which I guess means medical imaging. Why that's better than making ATR-102s I can't imagine :sad: