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E 104

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überarbeitet am 16.11.2010

The Telefunken E 104 is a set only rarely found in Switzerland, it's a very heavy and bulky allwave receiver mainly used for maritime and commercial point-to-point communications constructed in the fifties.

Double conversion above 5,9 MHz, single conversion below 5,9 MHz, 2nd resp. 1st I.F. 525 kHz

Analog dial, max. 2 kHz

AM, CW, SSB, NFM

1,1 - 30,1 MHz

Selectivity -6 dB
200 / 500 Hz; 1 / 3 / 6 / 12 kHz

Sensitivity
AM < 1,5 uV, CW < 0,13 uV

RF gain, three speed AGC, crystal calibrator 100 kHz

The E 104 has been produced in different variants from the mid-fifties until the sixties, at has found use in maritime communications and in commercialwurde point-to-point communications (presse /weather reports), some of the receivers have been exported to France and Belgium, that's why from time to time, sets with french frontpanel lettering turn up.
A close relative to the E 108 is the VLF - mediumwave receiver E 108 with a similar design.

To the displeasure of many collectors, this receiver is extremely bulky and heavy, it's 555 x 480 x 590 mm wide and will take a lot of space on the desk in You shack, as long as Your desk can support the weight of 70 kg; in it's desktop cabinet, the receiver has a weight of 86 kg - not a one man lift for me anymore...
The receiver can be powered from different AC voltages from 110 to 240 V and has a power consumption of 130 Watts with it's 24 tubes and two stabilizers.

The top third of the frontpanel is taken by the linear dial; when You turn the large bandswitch, the dial is rotated up and down. In the high frequency bands, only the MHz - digits behind tiny windows are exchanged.
In the left lower quadrant of the front panel, You find the rotary controls in three rows: the BFO control with it's +/- 3 kHz range, the crystal calibrator switch and the reception mode selector. In the middle row, You find the control to adjust the level of the line out output and the AGC time selector and in the bottom row the bandwidth selector and the controls for audio and radio frequency (RF Gain) gain.
In the right lower quadrant of the receiver's front panel, You find two measuring instruments: The left can be set as signal strength meter and control instrument for different tube voltages (switch Kontrolle), the right acts as a tuning indicator for FM reception. Below, You find the main tuning knob with a 1:10 fine tuning gear and the rugged bandswitch, sometimes this has to be moved with some efforts, You might have a look at the innards of the receiver and You will understand...

The receiver acts as single conversion receiver with an i.f. of 525 kHz in the low frequency bands below 5,9 MHz, in the high frequency bands, the signal is converted to a first i.f. of 1,1-2,2 MHz, 1,9-4,1 or 3,9-6,1 MHz (according to the selected band) and then to a second intermediate frequency of 525 kHz.
After having passed the I.F. filter bank, the signal is fed to the AM and FM detector, a BFO can be used to receive CW and single sideband signals.

There has been an optional FSK demodulator Fs Tg 127 for the reception of radioteletype signals and a BP 102 single sideband demodulator to match the E 104.

The E 104 is a classic collector's set, because of it's large dimensions and it's enormous weight, it probably didn't find it's way into too many amateur radio shacks. It is an excellent AM receiver and performs similarly to the EK-07 or Collins R-390, the dial accuracy has been above average, when it was new, today with PLL synthesized receivers, You get used to a dial resolution of 10 or 100 Hertz..

p.s. I'm still looking around for one (or even two) bezels for the frequency dial missing on my receiver...

© Martin Bösch 4.10.2008