Stereo-Rundfunk Einsatz (Multiplex-Decoder) 14

SABA; Villingen

  • Year
  • 1963/1964
  • Category
  • Radio module post 1925 (not a part, not a key)
  • ID
  • 24777
    • Brand: Schwer & Söhne, GmbH

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • 5
  • Wave bands
  • - without
  • Power type and voltage
  • Powered by external power supply or a main unit. / 30 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from
  • Model: Stereo-Rundfunk Einsatz 14 - SABA; Villingen
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 35 x 95 x 116 mm / 1.4 x 3.7 x 4.6 inch
  • Notes
  • Der Multiplex-Decoder 14 ist der erste transistorisierte Stereo-Decoder von Saba.
    Stereo-Anzeige über magisches Auge EM87.
    Dioden: 11× AA119.
  • Net weight (2.2 lb = 1 kg)
  • 0.3 kg / 0 lb 10.6 oz (0.661 lb)
  • Price in first year of sale
  • 117.00 DM
  • External source of data
  • Erb

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Forum contributions about this model: SABA; Villingen: Stereo-Rundfunk Einsatz 14

Threads: 2 | Posts: 6


I recently purchased a SABA continental 3050US with Stereo Decoder (Breisgau Radio Chassis with Dual 1008 turntable and remote control).  The unit was not working.  Checked and replaced several valves, replaced the capacitors specific to North America (60Hz) and cleaned the autotuning mechanism that was jammed.  The unit is working very well with the exception of the Stereo Decoder (I think).  The sound is phenomenal.

The Stereo works fine for about 30 minutes, before the stereo indicator (EM87) slowly opens completely and then there is no sound.  The quality of the stereo signal degrades slowly after about 20 minutes before being completely unacceptable by the time it stops working altogether (after 30 minutes).  If I shut the system down and let it "cool" and start it up, the stereo is fine again.  I have tested this several times and it is very consistent. 

If I switch to MONO, it works perfectly, even after the stereo stops working.

I have checked pin4 on the decoder and get about 28 VDC (a little less then the 30VDC specified).  I have researched a little and found that the transistors in these early units degrade over time and develope whiskers (AF117 & AF118).  I have ordered some AF117 and AF118 transistors (and AF127 which is a substitute for the AF117), but suspect they might have the same problem.  I have removed the shield from T3 to see if this would improve things.  Same result.

Does this sound like a decoder problem?  Are the transistors the most likely problem?  Is there a better way to fix the problem then just replacing with NOS transistors?  Are there modern transistors that can be substituted with some circuit modifications?

Thank you for your help.


Peter Pledge, 02.Jan.12

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