Telefunken STM1 HiFi Stereo Main Amplifier, 1980-1981, made in Germany

 

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THE STM 1 was the power amplifier in Telefunken's 1980 'state of the art' Hifi System. It practically contains the power amp section used in the TA 750, modified to fit into a 'slim-line' case. The power transistors in TO-3 case were replaced with types in plastic case, and the heatsink is flatter and wider and extends out ouf the housing at the rear side. The power amp board is the same, however a lot of components responsible for auxiliary supplies could be removed. The plastic frame with the main rectifier diodes and filter capacitors remained, but was 'laid flat' to make it fit.

Country: Germany
Manufacturer / Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Year: 1980/1981 Category: Audio Amplifier or -mixer
Semiconductors (the count is only for transistors) Semiconductors present.
Reception principle Audio-Amplification
Wave bands - without
Details Hi-Fi equipment
Power type and voltage Alternating Current supply (AC) / 110; 220 Volt
Loudspeaker - This model requires external speaker(s).
Power out
Model: HiFi Stereo Main Amplifier STM1 - Telefunken Deutschland TFK,
Material Metal case
Shape Book-shelf unit.

Nominal Output Impedance: 4 Ohms
Nominal Output Power: 2 x 85 W RMS
Peak Output Power: 2 x 120 W
Distortion Factor: < 0.1% @ 90 W / 1 kHz
Power Bandwidth: < 5 Hz ... > 58 kHz for K <= 0.5%
Dampening Factor: 20 @ 40 Hz / -12.5 kHz
Nominal Input Voltage: 1 V
Nominal Input Impedance: 47 kOhm
Output Level at 18.5 V at speaker output (4 Ohms)
Nominal Output Power: 7.4 V at headphone (200 Ohms)

Channel Separation:

• > 64 dB @ 1 kHz 
• > 47 dB @ 10 kHz 

General
Semiconductors:

• 7 integrated circuits 
• 14 transistors 
• 12 diodes 
• 21 LEDs 

Power Supply: 220 / 110 V AC
Fuses:

• Mains 220V = 1 x T 4 A 
• 110V = 1 x T 6.3 A 
• Secondary 4 x T 4 A (Power Amps)
• 2 x T 200 mA 

Weight: 8.8 kg
Dimensions (WHD) 482 x 76 x 350 mm / 19 x 3 x 13.8 inch (482 x 80 x 390 mm (W x H x D) )

Notes

• Telefunken HiFi Stereo Amplifier Main STM 1
• HiFi amplifier
• Frequency range 5-58000 Hz
• 2 × 85/120 W into 4 ohms
• Front in aluminum champagne metallic or metallic-brown, with front handles
• The matching preamp is STP1

Collectors' prices
Mentioned in -- Original prospect or advert

Downloads
1980-81 catalogue
1979-80 catalogue

Service Manual