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Country:  Germany
Manufacturer / Brand:  Tefag; Telephon Aktiengesellschaft vorm. J. Berliner
alternative name
Telephon-Fabrik, AG vorm. J. Berliner
Year: 1941–1943 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: EF13 ECH11 EBF11 EF11 EM11 EL12 EZ12
Main principle Superhet with RF-stage; ZF/IF 468 kHz
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast, Long Wave and more than two Short Wave bands.
Power type and voltage Alternating Current supply (AC) / 110-240 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Model: L45W - Tefag; Telephon
Notes ist ein Lorenz!
Source of data Radiokatalog Band 1, Ernst Erb
Circuit diagram reference Schenk-Regelien (??)

All listed radios etc. from Tefag; Telephon Aktiengesellschaft vorm. J. Berliner
Here you find 255 models, 172 with images and 107 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Tefag; Telephon: L45W
Threads: 2 | Posts: 3
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tefag: L45W ; Power supply - Output power
Robert Sarbell


What appears to be the major reason for the makers of the L45W model radios to use the very high voltage range for the FW rectifier - the EZ12 in lieu of the EZ11? The tube data suggests a maximum of 500 volts.

I have noticed that the later models produced in 1949/50 have the additional speakers and the UKW tuner. . . .And in some instances the rectifier has been used for theater audio systems employing output tubes requiring noticeably higher output power





Paul Reid

>  reason for the makers of the L45W model radios to use the very high voltage range for the FW rectifier - the EZ12 in lieu of the EZ11?

And 100mA-125mA versus 50mA.

The EL12 alone can pull 80mA. With 5mA-20mA in the rest of the radio, the EZ11 is far too small, the EZ12 is about right.

>  rectifier has been used for theater audio systems ... higher output power

Home radio power is usually one tube in Class A (especially where tubes were taxed).

Theater systems were usually two power tubes in push-pull, and by the late 1930s often near Class B. This can be considerably more efficient.

8 Watts is a big radio. (In the US where more tubes meant higher sales-price without higher use-tax, we would go 4W-5W in one tube then go to two 6V6 tubes push-pull for 8W to 14W.)

Two such tubes in push-pull at 400V 125mA could deliver 30 Watts. (25W-40W amps were standard in theaters, even large US movie-theaters. Hard to believe in this day of 250 Watt home "media systems" and multiple 1500 Watt amps in small movie theaters.) 

Also: the radio DC supply powered the speaker field-coil, with about half the DC power as the audio output power. At least in the US, theater speaker field-coil supplies were separate from the amplifier, and usually on-stage rather than back in the projector booth with the amplifiers.

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tefag: L45W;
Andreas Steinmetz

Wichtiger Reparaturhinweis: Vor dem Chassisausbau muß der Lautsprecher ausgebaut werden. Bei Nichtbeachtung zerbricht das Skalenglas!

Andreas Steinmetz

Tefag; Telephon: L45W
End of forum contributions about this model