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1004W (1004 UKW)

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1004W ; Grundig Radio- (ID = 48757) Radio
Grundig Radio-: 1004W [Radio] ID = 48757 883x600
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For model 1004W (1004 UKW), Grundig (Radio-Vertrieb, RVF, Radiowerke)
Country:  Germany
Manufacturer / Brand:  Grundig (Radio-Vertrieb, RVF, Radiowerke)
alternative name
Grundig Portugal || Grundig USA / Lextronix
Year: 1951/1952 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: ECH42 EF41 EAF42 EL41
Semiconductors (the count is only for transistors) Tr.Gl.=Metal-rectif.
Main principle Super-Heterodyne (Super in general); ZF/IF 468/10700 kHz
Tuned circuits 6 AM circuit(s)     6 FM circuit(s)
Wave bands Broadcast, Short Wave plus FM or UHF.
Power type and voltage Alternating Current supply (AC) / 110; 125; 220; 240 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 18 cm = 7.1 inch
Power out
from Model: 1004W - Grundig Radio-Vertrieb, RVF,
Material Wooden case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 450 x 293 x 220 mm / 17.7 x 11.5 x 8.7 inch
Notes UKW-Demodulation mit Flankengleichrichter.
Net weight (2.2 lb = 1 kg) 6.6 kg / 14 lb 8.6 oz (14.537 lb)
Price in first year of sale 248.00 DM
Collectors' prices  
Source of data Kat.d.Rundf.GrossH.1952/53 / Radiokatalog Band 1, Ernst Erb

All listed radios etc. from Grundig (Radio-Vertrieb, RVF, Radiowerke)
Here you find 5982 models, 5190 with images and 4030 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Grundig Radio-: 1004W
Threads: 1 | Posts: 3
Hits: 576     Replies: 2
grundig: Grundig radion model 1004W_FM detection?
Ake Nyholm


It should be very interesting to know how does FM-detection work in this model? Is it some kinf of "slope detector"

Kind regards



Dietmar Rudolph

The Grundig 1004W is a model from the beginning of the FM era. In these times the radio factories still experimented with different concepts for combined AM/FM receivers.

  • The mixer is a heptode ECH42 for AM and FM.
  • The first IF stage uses an EF41. However this stage is used for FM IF only, not for AM IF. Additionally it works as reflex amplifier for the AF signal.
  • The second IF stage uses an EAF42, which has one diode only for detection of AM and FM signals. For FM detection indeed slope demodulation [in German: Flanken-Demodulation] is used. 
    Whereas slope demodulation for TV applications was familiar, and posed no problem because the FM IF is fixed due to the frequency difference between picture carrier and sound carrier.
    For FM Radio reception there is a problem in so far as there are two IF filter slopes which are suited for FM demodulation. This gives an ambiguity when the station is tuned in.
  • Behind the volume control the demodulated AF signal goes to the EF41 (first IF) and is amplified there. Behind the FM IF circuit the amplified AF signal goes to the grid of the EL41.
  • The EF41 stage has a reduced AGC. For FM only no AGC would be better, because the EF41 works as an amplitude limiter. However for the AF signal this AGC is helpful in order to equalize the loudnes of the received stations, especially for AM stations.

The best schematic for analysing the receiver ist the 3rd one on the model page.

Best regards,


Ake Nyholm

Dear Dietmar,

Thank you very much for your comprehensive and clear explanation of the 1004 operational principles. This is quite expectional construction and obviously  also the cost economy has been in mind, when this model was made.

In Finland FM broadcasts started in 1953 as well as  manufacturing of FM  local receivers but this kind of concept I have never seen here.

Slope demodulation in TV receivers I do know due to my work experience.

Kind regards


Grundig Radio-: 1004W
End of forum contributions about this model