Diplomat 59W

Luxor Radio AB; Motala

Data
Forum
Pictures
Collections

  • Year
  • 1945/1946
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 18201
    • alternative name: Luxorita - voir Luxor Radio AB Suède (Sweden)

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

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • Superheterodyne (common)
  • Wave bands
  • Broadcast, Long Wave and more than two Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • Permanent or electro-dynamic (moving coil), system not known yet.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Diplomat 59W - Luxor Radio AB; Motala
  • Dimensions (WHD)
  • 620 x 390 x 280 mm / 24.4 x 15.4 x 11 inch
  • Notes
  • 4 x KW
  • External source of data
  • E. Erb 3-907007-36-0
  • Circuit diagram reference
  • Die «Thali Schemasammlung» führt das Modell.
  • Picture reference
  • Das Modell ist im «Radiokatalog» (Erb) abgebildet.

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 Forum

Forum contributions about this model: Luxor Radio AB;: Diplomat 59W

Threads: 1 | Posts: 1

The AF section has a push-pull output stage with a CR-RC-net between preamp and output stage to shift phase. In addition the net is condemned to work as a tone control, too.

Both of the 6V6 get the signal from the plate of the preamp stage. In order to save the phase splitter stage or to evade patents, the model shifts phase with two caps.

The signal passes from the plate of 6Q7 via C48 (100nF)
- for the upper 6V6 C65 (1nF) and R30 (1k) to the grid -> phase +90°
- for the lower 6V6 R10 (300k) and R31 (1k) to the grid. Between both, there is C63(?, hard to read) of 1500pF grounded -> phase -90°
The remaining switchable resitors are part of the tone control net. Depending of switch position, there are 6 possible adjustments.
The extreme positions of the tone control switch effect to no push pull operation at all
- one shorts the grid of the upper 6V6 to ground
- the other switches the grid of the lower 6V6 via R31 and R27 (10k) to ground

Values of the parts were taken from a friend.'s unit. He also took output power measurements: Full power of 5 Watts at 10% distortion is reached only at 1kHz and switch position R21 grounded. Besides of 1kHz loss of power is dramatic, -4.4dB at 500Hz/3kHz, -6dB at 250Hz/4kHz.

Marc Gianella, 07.Feb.10

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