Sinfonia 4R/422

Graetz, Altena (Westfalen)

  • Year
  • 1956/1957
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • ID
  • 81180

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

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • Superheterodyne (common); ZF/IF 460/10700 kHz
  • Tuned circuits
  • 8 AM circuit(s)     13 FM circuit(s)
  • Wave bands
  • Broadcast, Long Wave, Short Wave plus FM or UHF.
  • Power type and voltage
  • Alternating Current supply (AC) / 110-240 Volt
  • Loudspeaker
  • 4 Loudspeakers
  • Power out
  • 5.5 W (unknown quality)
  • Material
  • Wooden case
  • from
  • Model: Sinfonia 4R/422 - Graetz, Altena Westfalen
  • Shape
  • Tablemodel with Push Buttons.
  • Dimensions (WHD)
  • 680 x 400 x 305 mm / 26.8 x 15.7 x 12 inch
  • Notes
  • Schallkompressor, Ferritantenne; Mag. Auge abschaltbar. Nahezu identisch mit Sinfonia 422. Bandbreite schaltbar.
  • Net weight (2.2 lb = 1 kg)
  • 16 kg / 35 lb 3.9 oz (35.242 lb)

 Collections | Museums | Literature


Forum contributions about this model: Graetz, Altena: Sinfonia 4R/422

Threads: 2 | Posts: 7


One of my hobby's is restoring Graetz Radio's from the years around 1955.

They are so well build and nice to restore. Right now I am busy with a Sinfonia 4R/422. Radio has a problem I would like your advice. The Radio scale on the FM is compressed and does not match the scale description anymore. Normally the FM scale runs from 88-100Mhz but on this Radio (and I have seen it 3 times before) the scale runs from 88 to+-107Mhz. The Radio was not modified at all before, it came with a pile of dust of 55 years. I noticed that if I turn C24 Capacitor there is no effect at all. Normally it would bring the scale in sync with the needle. Also tried to replace C27 and C26 but without success. Now before I replace all without success I wonder if one of you do know a solution for this problem.

Thanks and with Graetz greetings!

Sierd Dijkstra




Sierd Dijkstra, 29.Mar.11

Weitere Posts (2) zu diesem Thema.

Ich habe ein Gerät (Chassis Nr. 329/56) mit der Rückwandbeschriftung "Sinfonia 4R/422 RAUMKLANG-SPITZENSUPER" und mit Logo und Kennzeichnung "Schallkompressor" auf dem Skalenglas. Es sieht nicht nach ersetzten Teilen aus.

Bernward Felbermair, 22.Jul.10

Weitere Posts (5) zu diesem Thema.