Bajazzo U 1953

Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH

Data
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  • Year
  • 1953/1954
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 4016

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 7
  • Number of Transistors
  • Main principle
  • Superhet with RF-stage; ZF/IF 452 or 472/10700 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)     10 FM circuit(s)
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Power type and voltage
  • Line / Batteries (any type) / 110; 125; 220 / 12 & 90 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) - elliptical
  • Power out
  • 0.27 W (max.)
  • Material
  • Bakelite case
  • from Radiomuseum.org
  • Model: Bajazzo U 1953 - Telefunken Deutschland TFK,
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 330 x 235 x 143 mm / 13 x 9.3 x 5.6 inch
  • Notes

  • 1. UKW-Koffer zum 50-jährigen Telefunken-Jubiläum;
    FM-Gleichrichtung: Diskriminator (Riegger-Kreis) mit 2 Germanium-Dioden.
    Batteriesatz: DM 31,40; Gewicht mit Batterien: 6 kg. Netzbetrieb: Gleich- und Wechselstrom. Sparschalter zur Reduzierung der Anodenspannung= 40% längere Betriebszeit.
    Antenne: 60 cm Stahlband (wie Rollbandmaß).

    Im Katalog des Rundfunk-Grosshandels 1953/54 nur als Bajazzo U bezeichnet.

    Siehe auch den äusserlich weitgehend identischen Nachfolger Bajazzo U 1954 mit zusätzlichem Langwellen-Bereich und geändertem FM-Demodulator (Ratiodetektor), der ab März 1954 erhältlich war.

  • Net weight (2.2 lb = 1 kg)
  • 4 kg / 8 lb 13 oz (8.811 lb)
  • Price in first year of sale
  • 269.00 DM
  • Mentioned in
  • Funkschau (FS 1953 Heft 11 S.208)
  • Literature/Schematics (2)
  • -- Original-techn. papers. (Service-Unterlagen 01.08.1953)
  • Literature/Schematics (3)
  • Rundfunk- Phono- und Fernseh-Katalog 1953-1954 S.63 (Thiele)
  • Picture reference
  • Eine Abbildung findet sich im Doppelband "Radios von gestern"

 Collections | Museums | Literature

Collections

The model Bajazzo U is part of the collections of the following members.

 Forum

Forum contributions about this model: Telefunken: Bajazzo U 1953

Threads: 1 | Posts: 4

Hello, everyone:

I bought this Telefunken Bajazzo U53 radio off eBay, it is working on AM, but no sound from FM. The FM front end and IF chain are working fine because another radio could pick up its 10.7Mhz IF signal before the FM discriminator, but there is no out put from the discriminator itself.

I carefully traced the connections found it was soldered differently than the schematics. I am attaching part of the schematics to show the discriminator. The red line is the actual soldering, but not exist on the schematics. I found there is no trace of recent repair, it seemed to be factory soldering or maybe very early repair.

My question is, would this be the reason of FM failure? If this is factory soldering, why is it different from the schematics?

Attachments

Songping Wan, 02.Apr.09

Weitere Posts (4) zu diesem Thema.