Kantate 3721W

Loewe-(Opta); Deutschland

Data
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  • Year
  • 1958/1959
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 21711
    • alternative name: Löwe Radio

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Number of Transistors
  • Main principle
  • Superheterodyne (common); ZF/IF 460/10700 kHz
  • Tuned circuits
  • 6 AM circuit(s)     10 FM circuit(s)
  • Wave bands
  • Broadcast, Long Wave and FM or UHF.
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 127; 160; 220 Volt
  • Loudspeaker
  • 2 Loudspeakers
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Kantate 3721W - Loewe-Opta; Deutschland
  • Shape
  • Tablemodel with Push Buttons.
  • Dimensions (WHD)
  • 490 x 310 x 250 mm / 19.3 x 12.2 x 9.8 inch
  • Notes

  • Ferrit-Antenne für MW und LW.

  • Net weight (2.2 lb = 1 kg)
  • 8.5 kg / 18 lb 11.6 oz (18.722 lb)
  • Price in first year of sale
  • 269.00 DM
  • External source of data
  • Erb
  • Literature/Schematics (1)
  • -- Schematic

 Collections | Museums | Literature

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The model Kantate is part of the collections of the following members.

 Forum

Forum contributions about this model: Loewe-Opta;: Kantate 3721W

Threads: 2 | Posts: 4

Dear collegues,

I did a restoration work on a Loewe Opta Kantate 3721w radio which involved replacing the power transformer, taken from a Philips BCH462A radio, replacing the levelling capacitors and replacing the selenium rectifier with two diodes.

Due to these changes the anode voltage increased to about 305 V, also due to the higher mains voltage, now of about 240 Vac. To reduce this anode voltage I inserted a load resistor which reduced the voltage to about 260 V. In addition to these interventions on the power supply circuit, I had to replace the coupling capacitor between the EABC80 and the EL84 and on the latter I also replaced the capacitor and the cathode resistor: at this point the radio has reached a good level of operation.

That said, I come to the point for which I ask for your opinion. 

Measuring all the voltages these are aligned with those indicated in the schematic, but I was surprised by the voltage I measured on the anode of the diode of the EABC80 pin2 which turns out to be about -46 V, with a good incoming signal, which frankly, in my little experience, I had never seen so high, so I ask if this represents a situation that can be considered normal or if instead it derives from some anomaly generated I don't know where and from what.

Thank you very much for the help you can give me.

Roberto
 

Roberto Licandro, 03.Sep.22

Weitere Posts (3) zu diesem Thema.

Hallo,
ich habe einen Kantate 3721, da läuft der UKW-Sender innerhalb der ersten 20 Minuten weg. D.h. der UKW-Oszillator (ECC85) ist nicht stabil. Er verändert seine Frequenz um 2 MHZ nach oben. Ich habe schon mehrere ECC85 ausprobiert, aber ohne Erfolg. Nach diesen 20 Minuten läuft er stabil und man muß nicht mehr nachstellen.
Bevor ich jetzt lange und zeitaufwändig such, dacht ich mir, fragst mal einen Fachmann ;-). Kennt jemand dieses Problem und weiß Abhilfe ?
Ich denke dass es nicht typspezifisch ist, sondern dass es bei anderen Herstellern das gleiche Problem geben könnte. Diese UKW-Empfangsteile mit der ECC85 waren ja bei vielen Radios dieser Zeit fast gleich.

Mit besten Dank im Voraus und vielen Grüßen
Andreas Sommerer

Andreas Sommerer, 14.Dec.05

Weitere Posts (1) zu diesem Thema.