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Gross-Super 876WK (T876WK)

Gross-Super 876WK ; Telefunken (ID = 21098) Radio
 
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Gross-Super 876WK ; Telefunken (ID = 2268341) Radio
Telefunken: Gross-Super 876WK [Radio] ID = 2268341 1400x823
Select picture or schematic to display from thumbnails on the right and click for download.
For model Gross-Super 876WK (T876WK), Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
 
Country:  Germany
Manufacturer / Brand:  Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Year: 1938/1939 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 6: ACH1 AF3 AB2 AL4 AM2 AZ1
Main principle Superheterodyne (common); ZF/IF 468 kHz
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast, Long Wave and Short Wave.
Details
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 Radiomuseum.org Model: Gross-Super 876WK - Telefunken Deutschland TFK,
Material Wooden case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 670 x 334 x 331 mm / 26.4 x 13.1 x 13 inch
Notes

Bandfiltereingang für LW und MW.
Variable Bandbreite.

Net weight (2.2 lb = 1 kg) 16.6 kg / 36 lb 9 oz (36.564 lb)
Price in first year of sale 298.00 RM
Source of data Handbuch WDRG 1938 / Radiokatalog Band 1, Ernst Erb
Circuit diagram reference Lange+Schenk+FS-Röhrenbestückung
Picture reference Eine Abbildung findet sich im Doppelband "Radio von gestern"


All listed radios etc. from Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Here you find 3459 models, 3030 with images and 2005 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Telefunken: Gross-Super 876WK
Threads: 3 | Posts: 8
Hits: 1927     Replies: 2
telefunken: [ Markt | Suche ] Telefunken 876 WK Zierleiste od. Gehäuse
Nikolaus Löwe
27.Oct.11
  1

Liebe Sammlerkollegen,

zur Aufarbeitung meines Telefunken 876 WK suche ich die rechte Zierleiste, oder ein Gehäuse wo sie noch vorhanden ist. Über Angebote würde ich mich freuen.

Mit freundlichem Gruß,

Nikolaus

Löwe

Martin Steyer
28.Oct.11
  2

Für die häufig fehlenden oder verbogenen Zierleisten der Telefunken-Gehäuse eignen sich sehr gut als Ersatz 4-mm-Aluminium-Schweißdrähte, die in 1 m langen Stangen erhältlich sind. Das Rundmaterial paßt genau in die Schlitze, man muß allerdings etwas "unterfüttern", weil sie sonst zu tief sitzen.

MfG, Martin Steyer

Nikolaus Löwe
28.Oct.11
  3

Vielen Dank für den Tip, Herr Steyer,

doch fehlt in meinem Fall auch die trapezförmige dunkelbraune Leiste aus Holz, also nicht nur der Einsatz aus Alu - der bestand aus einem Holzstab mit U-förmig herumgebogenem Alu-Blech.

Die Anfertigung einer komplett neuen Leiste incl. Alu-Stab nehme ich in Angriff, wenn sich kein Original-Ersatz finden läßt. Farbton und Material sind für mich nicht ohne weiteres zu imitieren.

Mit freundlichen Grüßen,

Nikolaus

Löwe

 

 
Hits: 1964     Replies: 2
telefunken: 876WK (T876WK); Gross-Super - schematic differences
Robert Sarbell
31.Jul.11
  1

Gentlemen,

Like Mr Carabas,

I am also beginning the alignment procedures on the early 1937/1938 Telefunken receivers; however, I am somewhat still curious to explain some minor circuit changes (or improvements).

In my model T776WK, the mixer-oscillator tube ACH1 does not reflect the addition of the small 250pF capacitor which bridges the kathode and the filament pins???

Then in the output stage, from the audio pre-amp in the AM2 tuning eye to the control grid, there is the identical coupling capacitor and the 0.5M ohm resistor phowever, the 776WK places a final 100 ohm resistor entering the grid. . . . . . .while in the 876WK the circuitry the corresponding resistor is rated for 1K ohms.

Are these 2 small parts significant enough to render the receiver "muted" if not precisely followed?

One last question - although I have had the radio for some time, I was not able to locate dropping resistor R43. If the previous owner (or technician) removed the item and did not replace it; could the item have been mounts somewhere on the loudspeaker assembly??

Respectfully,

Robert

I would also like to express my sincere Appreciation and Thanks to member Mr Hugo Sneyers for the replacement of the complete BF2 cylinder - without which the Telefunken Gross-Super could not be "restored". . . . . . . . . . 

NOTE: I have prepared what I believe to be a complete "TFK 776WK Alignments" procedural checklist (in English) if one of the radio engineers would be kind enough to review my efforts. I have not yet "folded in" the Illustrations, but I have included a brief description of the needed graphics. I have also included the use of my recently acquired Rohde & Schwarz BN4114 Signal Generator as one of the principal test equipment items.  

Johann Leber
03.Aug.11
  2

Hi Robert.

 1)In Model Tfk 876WK the 250pF bridges the filament to ground, Katode is grounded directly

 2) the two smal Parts 100 ohm/ 1 k should prevent the AL4 from VHF generating. The value isn,t so important. Usualy it is 50 Ohm to 1k.

3) Resistors R43/44/45 divide the Ug2 for the ACH1/ AF3 aprox. 80 Volts. R45 in the same way reduces the voltage by aprox. 5 Volts.They are adjustable at the Chassis backside, for strong Stations. You find all these Items on the innerchassis.

4) I would like review your english Aligment, please send them by email. Regards J. Leber

Robert Sarbell
03.Aug.11
  3

Hello Johann,

Thank you so much for the information - the main reason I was asking is because the original illustrations depicted the R43 dropping resistor connecting from AF3 pin7 over to the AL4 pin 7 and it seemed to be "out  of place". I realize that frequently some tube pins are used strictly for connecting points. . . . . . . .

I have also prepared the accompanying "setup" procedures which were produced by Telefunken to assist in the correct alignment steps for these peculiar radios. 

I will send both files (via email) for your review  - and also add the comment that some other German members have had some "challenges" as recently as January 2010 while attempting to align the specific TFK 776WK - because of the peculiar front end.

Respectfully,

Robert

 
Hits: 2384     Replies: 1
telefunken: 876WK (T876WK); Gross-Super
Ion Carabas
21.Mar.11
  1

Dear collegues,

I need your help. From a long time I am trying to restaure an Telefunken 876 wk. 

I am now at the alignment stage of both medium frequency trasformers. , or the 468 Kth frequency. 

From speciality literature the aligment is done by opening the potentionmeter at hight sounds , obtaining in this way an width passing band.

At 876 wk radio device the primary medium frequency transformer is mobile and it can be rotated , being actioned by the knob wich adjust the tone.

The armature wich covers the medium frequency transformers have two holes to access the coils. The holes are positioned at 90 degrees one from another. 

In this case, the access at the iron center of the coils is made when these are at 90 degrees one from another, wich correspond to low sounds on tone knob, where the passing band is contracting. 

How can I proceed to align correctly the both medium frequency transformers?


This operation must be done because the condensers mountel in paralel with the coils have been changed because the original ones did not match. 

Thank you, 

Best regards, 

Eng. Ion Carabas

 


 

Johann Leber
21.Mar.11
  2

Hi Ion

Generaly the Aligment should be done when the IF Coils are in the lowest coupling position. In this case you see all the aligment coils. It is  not important wich position has the tone potentiometer. In your case is the Sound at the lowest position. This is o.K. The correct Aligment is if you see all the aligment coils. ( sound is now lowest )    regards  J. Leber

 
Telefunken: Gross-Super 876WK
End of forum contributions about this model

  
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