Ultradyne L2 UV tubes

Phenix Radio Corp.; New York

  • Year
  • 1924/1925
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 50438
    • alternative name: Lacault, R.E.

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

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • Superheterodyne (common); ZF/IF 115 kHz
  • Tuned circuits
  • 7 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Ultradyne L2 [UV tubes] - Phenix Radio Corp.; New York
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 32 x 9 x 10 inch / 813 x 229 x 254 mm
  • Notes
  • The Ultradyne L2 was first manufactured for the UV201A with thoriated filament, which was announced in December 1922. In August 1925 the UV201A was withdrawn and replaced by the UX201A. They have later also been fitted with UX112, UX171 or UX171A but we don't put that into the tube line up as "or" because that was at least a year later of the UX201A variant.

    The Ultradyne L2 is a super with RF reaction. Whether it is similar to the Keystone L2's is uncertain. The manufacturer Keystone Radio Service offered kits according to The Radio Trade Directory of Aug.,1925.
    Two dials (primary tuning control knobs).
    Siehe auch Triodensuperhets.
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
  • Literature/Schematics (2)
  • Radio Broadcast, Nov. 1924, p. 111

 Collections | Museums | Literature


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


Forum contributions about this model: Phenix Radio Corp.;: Ultradyne L2

Threads: 1 | Posts: 1

Die Besonderheit der Ultradyne-Schaltung liegt darin, dass die Mischtriode keine Anodengleichspannung erhält. Stattdessen liegt sie an der Oszillatorwechselspannung. und wird damit voll durchgesteuert.

Die Anodenspannung für die Mischtriode kommt galvanisch über mehrere Spulen (1.ZF-Filter und Eingangskreis-Rückkopplung) vom Gitter der Oszillatorröhre. Am Gitter der Oszillatorröhre steht die Schwingung leicht ins negative verschoben, mit 50 V positiver und 60 V negativer Halbwelle. Entsprechend an der Mischeranode (Oszillogramm ohne Eingangssignal, bei verstimmtem Eingangskreis).


Konrad Birkner † 12.08.2014, 02.Sep.11

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