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Sonra Sekretär III 697/62GWU

Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 103668) Radio
 
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 512959) Radio
 
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 512960) Radio
 
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 572716) Radio
 
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 512961) Radio
 
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 512962) Radio
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 1607268) Radio Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 233667) Radio
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 233668) Radio Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 1607270) Radio
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 61972) Radio Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 233666) Radio
Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 365253) Radio Sonra Sekretär III 697/62GWU; Stern-Radio (ID = 1607269) 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
Sélectionnez une image/schéma pour afficher des vignettes sur la droite et cliquez pour télécharger.
Pour le modèle Sonra Sekretär III 697/62GWU, Stern-Radio Sonneberg, VEB, RFT; SONRA; -vorm.: EAK (Ostd.) - ex. AEG
 
Pays:  Allemagne
Fabricant / Marque:  Stern-Radio Sonneberg, VEB, RFT; SONRA; -vorm.: EAK (Ostd.) - ex. AEG
Année: 1958/1959 perfect model Catégorie: Radio - ou tuner d'après la guerre 1939-45
Lampes / Tubes 6: UCC85 UCH81 UABC80 UBF89 UM80 UL84
Semi-conducteurs (seuls les transistors sont comptés) Tr.Gl.=Metal-rectif.
Principe général Super hétérodyne (en général); FI/IF 473/10700 kHz
Circuits accordés 6 Circuits MA (AM)     9 Circuits MF (FM)
Gammes d'ondes OM (PO), OL (GO) et FM (MF).
Particularités
Tension / type courant Appareil tous courants (CA / CC) / 220 Volt
Haut-parleur HP dynamique à aimant permanent (bobine mobile) - élliptique / Ø 22 cm = 8.7 inch
Puissance de sortie 2 W (qualité inconnue)
De Radiomuseum.org Modèle: Sonra Sekretär III 697/62GWU - Stern-Radio Sonneberg, VEB,
Matière Boitier en bois
Forme Modèle de table, avec boutons poussoirs.
Dimensions (LHP) 570 x 315 x 190 mm / 22.4 x 12.4 x 7.5 inch
Remarques

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.

Poids net 7.5 kg / 16 lb 8.3 oz (16.52 lb)
Prix de mise sur le marché 400.00 DM
Source Radiokatalog Band 2, Ernst Erb
Littérature Die Geschichte der Rundfunkindustrie der DDR Band 1 1945 - 1967
Schémathèque (1) Service-DVD Funkverlag B. Hein

Modèle crée par Peter Edgar Kirchhof. Voir les propositions de modification pour les contributeurs supplémentaires.



Tous les appareils de Stern-Radio Sonneberg, VEB, RFT; SONRA; -vorm.: EAK (Ostd.) - ex. AEG
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Contributions du forum pour ce modèle
Stern-Radio: Sonra Sekretär III 697/62GWU
Discussions: 1 | Publications: 3
Vus: 1712     Répondre: 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
Fin des contributions forum pour ce modèle

  
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