My Telefunken Collection


Device Type

Analog Tuner

Start of Sale


General Description

This is the simplest tuner from the silver series, if you don't count the midi-stype MT2. Nothing fancy, but it works, and it can nowadays be had for very few money...


UKW/MW, variable capacitor tuning, LED signal strength indicator, exact tuning indicator, mono switch, AFC (switchable), muting (switchable)


AF Output (DIN), Antenna (75 Ohms asymmetric 240 Ohms symmetric AM/FM)

Technical Data

(taken from the user's manual)

FM Receiver
Wave Band: 87.5 - 108 MHz
Circuits: 12, 4 adjustable
Sensitivity: <0.9 µV at 75 Ohms
(26 dB/40 kHz deviation)
Limit Range: <1.2 µV for -3 dB at 75 Ohms
Intermediate Frequency: 10.7 MHz
IF Bandwidth: 150 kHz
Selection: 60 dB (2 signal method)
Mirror Selection: >75 dB
Capture Ration: 2 dB
Phase Suppression: >60 dB
Carrier Signal Suppr.: >60 dB
Frequency Response: 22 Hz - 15.0 kHz
Distortion Factor: <0.5 % stereo
<0.3 % mono
Cross Talk Dampening: 40 dB
Voltage Ratio: >64 dB stereo
>66 dB mono
S/N Ratio: >62 dB stereo
>66 dB mono
Range of Strength Display: 1 µV - 2 mV
Stereo Threshold: ~5 µV at 75 Ohms
AM Receiver
Sensitivity: 10 µV at 600 kHz
(at 1 kHz 30% Modulation)
Wave Band: MW 520 - 1610 kHz
Circuits: 5, 2 adjustable
Intermediate Frequency: 460 kHz
IF Bandwidth: 4.2 kHz
Voltage Ratio: 53 dB at U = 10 mV,
1 kHz, 30% Modulation
Range of Strength Display: 20 µV - 50 mV
Components: 4 Integrated Circuits
15 Transistors
12 Diodes, 7 LEDs
Mains Connection: 220/110 V
Fuses: 1 x T 630 mA
1 x T 315 mA
1 x T 100 mA
Dimensions: 435 x 56 x 250 mm
Weight: ~ 3.5 kg

Common Failures

Believe it or not - corrosion! Below is a common picture of an RT100 that has been in service for more than 15 years:

The most probable reason for this corrosion is the light bulb that illuminates the frequency display. There is almost no clearing above the lamp, which means that the cover becomes very hot at this place. All chemical reactions, including corrosion, increase their speed when the temperature increases...of course, the lamp (~12V) is also burned in most cases and needs a replacement. I usually use a standard E10-socketed bulb and solder the cables to the bulb. It may also be necessary to replace the ring of green transparent plastic foil that makes the illumination look greenish. However, it is also possible to leave it out; the illumination won't be green any more, but still looks good (as in the device shown above...).

Spare Part Numbers

(taken from Telefunken's 1981-1991 Service Handbook)

ICs, Transistors, Diodes
Transistor 3SK59GR 339 556 438
Misc. Electrical Parts
12V Lamp 339 560 306
Service Information 339 407 135

Available Documents

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©2000 Alfred Arnold,