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3055WF/3D

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3055WF/3D; Grundig Radio- (ID = 55326) Radio
Grundig Radio-: 3055WF/3D [Radio] ID = 55326 794x591
Select picture or schematic to display from thumbnails on the right and click for download.
For model 3055WF/3D, Grundig (Radio-Vertrieb, RVF, Radiowerke)
 
Country:  Germany
Manufacturer / Brand:  Grundig (Radio-Vertrieb, RVF, Radiowerke)
alternative name
 
Grundig Portugal || Grundig USA / Lextronix
Year: 1955/1956 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: ECC85 ECH81 EF89 EBF80 EM34 or EM35 EABC80 EL84
Main principle Super-Heterodyne (Super in general); ZF/IF 468/10700 kHz
Tuned circuits 8 AM circuit(s)     12 FM circuit(s)
Wave bands Broadcast, Long Wave, Short Wave plus FM or UHF.
Details Radio Control (+Remote Wire etc)
Power type and voltage Alternating Current supply (AC) / 110; 125; 160; 220 Volt
Loudspeaker 5 Loudspeakers
Power out 5.5 W (unknown quality)
from Radiomuseum.org Model: 3055WF/3D - Grundig Radio-Vertrieb, RVF,
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 665 x 427 x 294 mm / 26.2 x 16.8 x 11.6 inch
Notes 2 FM- und 1 AM-Station mit Tasten wählbar; drehbare Ferritantenne mit beleuchteter Anzeige.
Net weight (2.2 lb = 1 kg) 18.3 kg / 40 lb 4.9 oz (40.308 lb)
Price in first year of sale 425.00 DM
Collectors' prices  
Source of data HdB d.Rdf-& Ferns-GrH 1955/56 / Radiokatalog Band 1, Ernst Erb
Mentioned in Guida Pratica Antique Radio III (2000)
Picture reference Das Modell ist im «Radiokatalog» (Erb) abgebildet.


All listed radios etc. from Grundig (Radio-Vertrieb, RVF, Radiowerke)
Here you find 5851 models, 5047 with images and 3959 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Grundig Radio-: 3055WF/3D
Threads: 1 | Posts: 6
Hits: 1700     Replies: 5
grundig: 3055WF/3D; High plate voltage on EABC80
Cuneyt Bakan
11.Apr.14
  1 Hello all, I am working on restoration of a Grundig 3055 3D radio. Plate voltage of EABC80 should be 51V per schematics but i am reading ~75V. Value of R47, R250 and R51 are correct (in 10% range). G2 of EL84 is ~222V. Filament voltage of EABC80 is ~6.25V. Grid voltage of EABC80 is ~0.350V. I thought that EABC80 became weaker due to it's age therefore plate current is reduced. I tried 4 different EABC80 but each time plate voltage was more or less the same. Any idea is welcomed. Thanks in advance, Cuneyt
Georg Beckmann
11.Apr.14
  2

Hi,

after a look at the schematic, the grid voltage is only defined from the 10MEG resistor. If this resistor is open, the grid is to negative, and the plate is to high. If you measure at the grid, possibly you can't see the right value.

For test, short the 10MEG and watch the plate voltage.

 

Another check is, if the cathode contact to ground is ok, perhaps there is a weak contact in the socket.

Good Luck

 

Georg

Cuneyt Bakan
11.Apr.14
  3

Thanks Georg.

Grid bias resistor of EAB80 is around ~11Mohms and I am reading -0.350V from the grid. Looking at the  chracteristhics of EABC80, this should give ~0.5 mA plate current with 50V plate voltage, which is close to current value in the schematics (0.4 mA).

There is something not clear in the schematics, probably I am missing something: Plate voltage of EABC80 should be :

V_plate_EABC80 = V_G2_EL84 - I_plate_EABC80 * (R51 + R250 + R47)

V_plate_EABC80 = 211V - 0.4 mA * 211Kohms = 126V

But it should be 51V per schematics. What is wrong in above equitation?

I will check the socket connections.

Thanks,

Cuneyt

 

 

Georg Beckmann
12.Apr.14
  4

Hi Cuneyt,

 

possibly the reason for the deviation is the measuring instruments used by the radio repair people.

The values in the schematic are the values measured with the instruments currently used.

look this one of course here

The impedance is about 100k in the 300V range. I estimate, that your modern instrument has 10Meg oder 100Meg.

Edit: In the schematic it is mentioned, that the voltages are measured with a tube voltage meter, this has an high input impedance of 10 Meg or more.

Georg

Georg Beckmann
14.Apr.14
  5

Hi Cuneyt,

Now, you get the answer directly from the former designer of this radios by Grundig, Mr. Hans Knoll:

->

Hallo Herr Beckmann.

Phänomen ist da nicht viel.

Wenn Sie nur kurz  gerechnet haetten Ub(schiene) = 221V. Ra 220+10Kohm =230 Kohm und 0,4 mA Ia macht einen Abfall von 80Volt

220V - 80 V = 140 Volt  Da stimmen keine 51, 60, oder 75 Volt. 

Das Schaltbild ist falsch.
Der 3055W -3D also ohne Fernbedienung hat einen Ra 200K + 200K zur Siebung.
Der 3055WF-3D hat wegen der FB einen Ra = 200k +10K zur Siebung.
Was das ergibt? 75 volt. Ua.
Anbei eine Kurve in die ich eine 200kohm Gerade eingezeichnet habe.
Bei einem Ia = 0,725 mA, liegen die 75 Volt and der Anode.

Das -Ug1 liegt bei ca. 0,65 Volt.

Also alles O.K.

Gruss Knoll 

-----------------------------------------------

short summary: The schematic is wrong. There are two types, the 3055W-3D without remote with

Ra 200k + 200k

The type 3055WF-3D  with remote Ra = 200k + 10k for decoupling.

With a plate current of 0.725 mA is the plate voltage 75V

grid voltage is about -0.65V

 

Cuneyt Bakan
15.Apr.14
  6 Many thanks Georg and Mr. Knoll for your helps. Cuneyt
 
Grundig Radio-: 3055WF/3D
End of forum contributions about this model

  
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