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Sonra Sekretär III 697/62GWU

Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 103668) Radio
 
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Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 1607268) Radio
Stern-Radio: Sonra Sekretär III 697/62GWU [Radio] ID = 1607268 800x600
Select picture or schematic to display from thumbnails on the right and click for download.
For model Sonra Sekretär III 697/62GWU, Stern-Radio Sonneberg, VEB, RFT; SONRA; -vorm.: EAK (Ostd.) - ex. AEG
 
Country:  Germany
Manufacturer / Brand:  Stern-Radio Sonneberg, VEB, RFT; SONRA; -vorm.: EAK (Ostd.) - ex. AEG
Year: 1958/1959 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 6: UCC85 UCH81 UABC80 UBF89 UM80 UL84
Semiconductors (the count is only for transistors) Tr.Gl.=Metal-rectif.
Main principle Super-Heterodyne (Super in general); ZF/IF 473/10700 kHz
Tuned circuits 6 AM circuit(s)     9 FM circuit(s)
Wave bands Broadcast, Long Wave and FM or UHF.
Details
Power type and voltage AC/DC-set / 220 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical / Ø 22 cm = 8.7 inch
Power out 2 W (unknown quality)
from Radiomuseum.org Model: Sonra Sekretär III 697/62GWU - Stern-Radio Sonneberg, VEB,
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 570 x 315 x 190 mm / 22.4 x 12.4 x 7.5 inch
Notes

Der Super Sekretär III 697/62 ist ein Allstromgerät mit 4 Tasten. TA- Betrieb ist deshalb nur über einen Trenntrafo möglich.
Ab Ende 1957 bis Anfang 1960 Verwendung des Markenzeichen "SONRA" auf den Rückwänden, Skalen und auf den Gehäusefronten.

Net weight (2.2 lb = 1 kg) 7.5 kg / 16 lb 8.3 oz (16.52 lb)
Price in first year of sale 400.00 DM
Collectors' prices  
Source of data Radiokatalog Band 2, Ernst Erb
Mentioned in Die Geschichte der Rundfunkindustrie der DDR Band 1 1945 - 1967
Literature/Schematics (1) Service-DVD Funkverlag B. Hein

Model page created by Peter Edgar Kirchhof. See "Data change" for further contributors.



All listed radios etc. from Stern-Radio Sonneberg, VEB, RFT; SONRA; -vorm.: EAK (Ostd.) - ex. AEG
Here you find 379 models, 300 with images and 277 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




 


Forum contributions about this model
Stern-Radio: Sonra Sekretär III 697/62GWU
Threads: 1 | Posts: 3
Hits: 1569     Replies: 2
stern-sonn: 697/62GWU (697/62 GWU); Sekretär III
Timo Haveri
31.Jan.10
  1

Hello. I have a problem with my Sekretär III radio. The FM doesn't work well when using the radio's own antenna. There is a lot of squealing and interference noise, especially in the higher frequency end of the scale. My theory is that the radio frequencies are coupled back into the antenna from the FM-section due to (originally) poor or weakened shielding somewhere. If I connect only one pin of the dipole-antenna or use just one wire as an external antenna the radio works quite well with only an occasional little squeal at some spots of the dial during tuning. Using it like that, normal listening is not affected very much so it is something that can be lived with. However, I would like to hear if someone else has experienced similar behaviour in their Sekretär radios or other models. Also if there is a way to fix the problem, I would appreciate your suggestions.

Timo

Konrad Birkner † 12.08.2014
26.Jul.10
  2

I put a German translation in a separate thread now.

Kobi

Konrad Birkner † 12.08.2014
27.Jul.10
  3

I got a suspicion: Neutralisation of the Tuner input triode. It is materialized by a 2.5 pF cap (C5). That might be off from the optimal value.

Other tuner constructions applied mostly a small trimmer cap for the purpose.

Jens Dehne told me that he would remember something alike from past experience. He made a photo of C5 location and we can look how to replace the part by a variable one. Care must be taken in such high frequency circuits, not to spoil their function by alterations to connections or wiring. Everything has an influence at 100 MHz what would be harmless in the BC band.

The UCC85 base has  C5 connected from pin 6 to 8.

It might have lost contact between wire and cap (even inside).
First of all unsolder one end and watch what will happen.

Without a dramatic change in FM behaviour I would say, C5 is defect.
Anyway try to replace it by a suitable Trimmer. If not at hand use some capacity close to 2.5 pF. Vary by 0.5 to 1 pF up and down.

 

Good luck!

 

 
Stern-Radio: Sonra Sekretär III 697/62GWU
End of forum contributions about this model

  
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