Searching for infos/schematics about Siemens console (811605)
- Thread starter thekid777
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analogguru
Well-known member
I had such a console, I think I sold it approx in 1992. As far as I remember I also had only the block diagram, must have a look in my archive.
The console is from approx the same era as the one shown in the link below so I think the topology could be similar to it:
http://www.wsw.cz/index1.htm
BTW, in the late 70´s and early 80´s I worked with such a console (from the link) in the studio. The best of it were those meters - I still have them :
The console was running on 24V DC - maybe the additional 24V is for the 48V Phantom-power (24V+24V = 48V).
analogguru
The console is from approx the same era as the one shown in the link below so I think the topology could be similar to it:
http://www.wsw.cz/index1.htm
BTW, in the late 70´s and early 80´s I worked with such a console (from the link) in the studio. The best of it were those meters - I still have them :
The console was running on 24V DC - maybe the additional 24V is for the 48V Phantom-power (24V+24V = 48V).
analogguru
Thanks analogguru
These vu-meter looks pretty nice
Just received complete book from Milan, thanks!!!
and docs of the console from Franz, thanks!!!
It works well now with 2X24V
I'm recapping all the channels now and will do the whole console.
Best regards
These vu-meter looks pretty nice
Just received complete book from Milan, thanks!!!
and docs of the console from Franz, thanks!!!
It works well now with 2X24V
I'm recapping all the channels now and will do the whole console.
Best regards
Jean Clochet
Well-known member
thekid777 said:
It's for setting the bias on the transistor. Use the voltages given on the schematic as a guide. So, trim R4 until you get 17.3V on Ts1 collector, or 17.9V on Ts2 emitter, or 10V on Ts3 emitter...
When I trim to get 11V on TS1 emmiter I get 17,62V on the TS1 collector (instead 17,3) 18,18V on TS2 emitter (instead 17,9) and 9.96V on the TS3 emitter (instead 10) , I can't get all the values right whatever I do.
It's still acceptable? I don't know which V is the most important to get precisely right. thanks
It's still acceptable? I don't know which V is the most important to get precisely right. thanks
Jean Clochet
Well-known member
What you have there is fine, as long as it's in the right ballpark as the schematic you're OK.thekid777 said:
What is listed is just a guide, tolerance of parts used etc. would hardly ever enable you to get exactly repeatable results with the schematic.
I suppose I might put the gain in the 'O' position myself while doing this.
One more thing, what's the voltage feeding the stage you're measuring? It says 18V on the doc. but I'm guessing it's a tiny bit higher. Not that it really matters
Jean Clochet
Well-known member
thekid777 said:The voltage running the channel is 20V
Will try with 0 position gain
OK thanks for satisfying my curiosity. Again, you're just fine where you are so don't worry too much about being exactly the same as the schematic.
If you come across a channel that you need to pick one transistor voltage to be the one to zone in on, then pick the emitter of Ts3 and make it half the supply voltage. Just as your 9.96V is in relation to the 20V supply.
It's a nice desk by the way
Jean Clochet
Well-known member
thekid777 said:
That's good.
thekid777 said:
I can't comment myself on anything other than the input stage bit that you posted as I've never seen the schematic before. I guess it's probably just typical of the technology used at the time on pro equipments. Uncomplicated, single-sided stages. I bet the eq is simple and musical - baxendall treble and bass and an inductor mid? Possibly the transformers used here would be less coloured in sound than Neve but I don't know... Also less colour because there are less caps involved and no tantalums?
You say it sounds good and that's what matters.
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