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STUDER TUBE MIXER 1958
Old 3rd September 2007
  #1
Here for the gear
 

STUDER TUBE MIXER 1958

Hi
I found an old STUDER 69 mixer build in 1958. The problem is that there is no power supply.

The mixer has 3 mic input module model 57
2 line input module model 70
1 eq module model 83
2 suming amps model 56
and 1 module ??? model 82
and all module have transformers on input and output (beyer, malotki and home made studer transformers).
All inputs and outputs are balanced.

Does someone know something about this unit ? Voltage needed ?
Schematics?
I have contacted STUDER switzerland but they dont have nothing anymore.
Old 2nd February 2016
  #2
Lives for gear
 

Hi
Heaters run at 12.6 Volts DC and HT is around 250 Volts DC.
I too am looking for the EQ schematic as well as the schematics for the supply.
The supply is interesting as it has the supply for the mixer, a 10 Watt power amplifier and loudspeaker and the 'drive' electronics for the modulometer.
If anyone has any other info it would be appreciated. Having just got the power amp working properly, and most of the channels it is great just to listen to although a separate 'Hi Fi' speaker sounds better but quieter.
Matt S
Old 3rd February 2016
  #3
Lives for gear
 
gyraf's Avatar
 

The Studer S69 could apparently be wired for either 6.3V OR 12.6V FF (heater voltage).

attached what I have on the subject - studer-s69-pages.pdf

Jakob E.
Attached Files
File Type: pdf studer-s69-pages.pdf (4.85 MB, 130 views)
Old 3rd February 2016
  #4
Lives for gear
 

Hi
Granted the channel modules have the 'option' of either 6.3 or 12.5 but the power amp which uses a pair of EL34 has them wired in series with no extra wire available for 'choice'.
As the heaters are run with DC it would be a massive current to supply at 6.3 Volts.
If any information is available for the power amp (actually pretty simple but has a good response to over 30KHz) 10 Watts output level.
Calibration details for the modulometer (and schematic) would be much appreciated.
I will be taking lots of pictures but 'reverse engineering' it all could take some time!
The design of the faders is a masterpiece but 'outrageous' in detail!
Matt S
Old 26th February 2016
  #5
Here for the gear
 

I have one of these Studers it came from Decca Studios in Vienna. Its just about finished being repaired by my local tech here in Los Angeles. He too was having trouble with the EQ module but I think it will be sorted out by the weekend. If anybody needs information on these modules I will be glad to tell you what I know or put you in contact with my man thats been working on it. Really an interesting piece of gear. Peace to all!
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