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Lyra (with Chladny Disc) Lyre Ch= 6D932

Lyra Lyre Ch= 6D932; De Forest DeForest (ID = 2246070) Radio
Lyra Lyre Ch= 6D932; De Forest DeForest (ID = 2246071) Radio
Lyra Lyre Ch= 6D932; De Forest DeForest (ID = 1164768) Radio
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Lyra Lyre Ch= 6D932; De Forest DeForest (ID = 1164768) Radio
De Forest DeForest: Lyra Lyre Ch= 6D932 [Radio] ID = 1164768 400x708
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For model Lyra (with Chladny Disc) Lyre Ch= 6D932, De Forest (DeForest) Crosley Radio, Consolidated Industries; Toronto:
Scanned from the DeForest Crosley Folder season 1936/37.
Country:  Canada
Manufacturer / Brand:  De Forest (DeForest) Crosley Radio, Consolidated Industries; Toronto
Year: 1936/1937 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 9: 6K7M 6A7M 86M 6K7M 6F7M 85M 6F6M 6F6M 5Z3
Main principle Superhet with RF-stage; ZF/IF 456 kHz; 2 AF stage(s)
Tuned circuits 10 AM circuit(s)
Wave bands Broadcast, Short Wave(s) and Police.
Power type and voltage Alternating Current supply (AC)
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Model: Lyra Lyre Ch= 6D932 - De Forest DeForest Crosley
Material Wooden case
Shape Console with any shape - in general
Dimensions (WHD) 26.5 x 40 x 14.25 inch / 673 x 1016 x 362 mm

The schematic labels the 85M as the voltage regulator while the tube layout has the 86M there. I believe the schematic is mislabeled and has the two tubes switched. A push-pull audio output circuit and an automatic bass booster is used in this model Lyra 6D932. The Rogers 11-95, 11-97, Majestic Resolution and Bonaventure are electronically identical to this set.

The DeForest Crosley console radio model Neptune wich chassis 6D731 and Lyra 6D932 show a "Chladni Disc for absorbing cabinet booming" (Chladni plate). This is a gadget for visualization of vibration patterns, by spreading a uniform layer of sand on a disk, and observing displacement when vibration is applied. It can be done with a loudspeaker. From Wikipedia (Feb 2012): "Ernest Florens Friedrich Chladni, born 1756 in Wittenberg (died 1837 in Breslau) was a Slowaky physicist, musician and astronome, living in Germany. One of Chladni's best-known achievements was inventing a technique to show the various modes of vibration on a mechanical surface. Chladni repeated the pioneering experiments of Robert Hooke of Oxford University who, on July 8, 1680, had observed the nodal patterns associated with the vibrations of glass plates. Hooke ran a bow along the edge of a plate covered with flour, and saw the nodal patterns emerge. Chladni's technique, first published in 1787 in his book, Entdeckungen über die Theorie des Klanges ("Discoveries in the Theory of Sound"), consisted of drawing a bow over a piece of metal whose surface was lightly covered with sand. The plate was bowed until it reached resonance and the sand formed a pattern showing the nodal regions. Since the 20th century it has become more common to place a loudspeaker driven by an electronic signal generator over or under the plate to achieve a more accurate adjustable frequency. Variations of this technique are commonly used in the design and construction of acoustic instruments such as violins, guitars, and cellos." There is a folder "Nuveaux Modèles de Luxe 1937" with le Neptune, le Lyre, le Comète, le Jupiter, l'Étoile Royale with door, which means season 1936/37.

Price in first year of sale 144.95 $
Circuit diagram reference Radio College of Canada
Mentioned in RCC Rogers-Majestic section page 19

Model page created by Robin Roeckers. See "Data change" for further contributors.

All listed radios etc. from De Forest (DeForest) Crosley Radio, Consolidated Industries; Toronto
Here you find 250 models, 105 with images and 169 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.