Siemens E566 Debeg
Department and University.
The tubed communication receivers of the fifties and sixties were so
heavy that somebody invented the term
for this type of receiver, and this is an example.
The Siemens E566 Debeg, known as the `Siemens Regenboog' (Rain bow)
receiver in Ham circles, is among Siemens top models of the early
See my other radios too!
(Here is the next one.)
It was made for maritime use, as can be seen from a logo under the
dial and the presence of the 14-21 kc band (submarine band);
I think there aren't any submarines under my town, because I have
never heard any.
Besides the submarine band, it covers 85 to 30.000 kHz completely in
11 bands, both AM and SSB. It offers the 27Mc (Citizen's band), the
various Ham bands (80, 40, 20 meters), the Shortwave broadcast bands,
as well as bands for maritime and aviational use.
The receiver has very good sensitivity and good selectivity (for AM
and SSB, not for CW) as well.
The frequency readout is accurate within 1kHz, which is quite an
achievement at that time, and this accuracy is obtained using the
On the higher bands (6 and up) the receiver is double conversion, with
the first Intermediate Frequency tuneable between 1080 and 1180 kHz
(and second IF 100kHz).
Changing the IF from 1080 tot 1180 kHz gradually adds 100kHz to the
frequency tuned into by the main tuning dial, and the offset can be
read on the small scale in the center of the dial.
Using the reference oscillator, the main dial can be set exactly to a
multiple of 100kHz.
It is a bit more cumbersome than tuning a modern digital receiver with
LCD readout, but it was the best 1960 could offer.
(1) 14-21 kc; (2) 85-175 kc; (3) 170-350 kc;
- (4) 340-730 kc; (5) 720-1540 kc; (6) 1,5-3,2 Mc;
(7) 3,1-6,4 Mc; (8) 6,0-10,3 Mc; (9) 9,7-15,3 Mc;
(10) 14,7-20,3 Mc; (11) 19,7-25,3 Mc; (12) 24,7-30,3 Mc.
Steel, size WxHxD = 52x33x35cm. Weight: 34 kg.
Seventeen tubes, 5 pilot lights, various protection light bulbs.
- RF chassis:
1. EF93 (RF-stage);
2. EF93 (reference oscillator);
3. EK90 (first mixer);
4. ECC82 (first local oscillator).
Frequency changer chassis:
5. EK90 (freq. doubler band 1 and 2);
6. EK90 (second mixer);
7. ECC82 (second local oscillator).
8. EF93 (IF stage wide);
9. EF93 (IF stage narrow);
10. EB91 (detector wide);
11-1. ECC82 (BFO and detector);
12-1. ECC82 (AF stage);
12-2. EB91 (noise limiter);
13. EL90 (output tube).
11-2. EM34 (tuning eye);
14. OA2 (voltage stabilizer);
15. OB2 (current stabilizer).
Pushbuttons 1-12 for bands, tuning,
Reference osc. and Frekwenzlupe,
- RF and AG gain, Noise limiter, switch BFO/narrow/wide,
AC (110/125/220/250V) 110W.
- A DC to AC converter can be connected and is switched with the
main power switch.
Teletype, Send/Receive switch (disconnects antenna),
- Antennas, Loudspeaker, Headphone.
Germany, early sixties.