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90A Baby Grand Middle

90A Baby Grand; Philco, Philadelphia (ID = 245896) Radio
 
90A Baby Grand; Philco, Philadelphia (ID = 509084) Radio
 
90A Baby Grand; Philco, Philadelphia (ID = 509085) Radio
90A Baby Grand; Philco, Philadelphia (ID = 377758) Radio 90A Baby Grand; Philco, Philadelphia (ID = 377759) Radio
90A Baby Grand; Philco, Philadelphia (ID = 377756) Radio 90A Baby Grand; Philco, Philadelphia (ID = 377757) Radio
90A Baby Grand; Philco, Philadelphia (ID = 1263053) Radio 90A Baby Grand; Philco, Philadelphia (ID = 1330242) Radio
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90A Baby Grand; Philco, Philadelphia (ID = 1494027) Radio
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90A Baby Grand; Philco, Philadelphia (ID = 377758) Radio
Philco, Philadelphia: 90A Baby Grand [Radio] ID = 377758 372x428
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For model 90A Baby Grand Middle, Philco, Philadelphia Stg. Batt. Co.; USA
 
Country:  United States of America (USA)
Manufacturer / Brand:  Philco, Philadelphia Stg. Batt. Co.; USA
Year: 1931 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 9: 24 24 27 24 27 27 27 47 80
Main principle Superhet with RF-stage; ZF/IF 175 kHz
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Alternating Current supply (AC) / 25 to 60 cycles, 115 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: 90A Baby Grand [Middle] - Philco, Philadelphia Stg. Batt
Material Wooden case
Shape Table-Cathedral-Type (upright, round top or gothic arch, not rounded edges only).
Dimensions (WHD) 18 x 19 x 12 inch / 457 x 483 x 305 mm
Notes

Models 90 and 90A were available in a cathedral, a lowboy, and a highboy cabinet. The chassis was made in three versions - an early model 90 and 90A with two 45 output tubes in push-pull, a middle version with one 47 output tube, and a late version with two 47 output tubes. Model 90 is for 115 VAC 50-60 Hz; model 90A is for 115 VAC 25-60 Hz.

The models 90 and 90A "early" and "middle" have a 4-gang tuning condenser plus 3 tuned IF circuit - both with IF 175 (Rider's change note 8-3). The version "middle", which are above serial number 237,001, of the model 90 and 90A has tubes: 24 RF, 27 osc, 24 1st det., 24 IF, 27 2nd det. rect., 27 det. amp., 27 1st AF amp, 47 output and 80 rectifier. The "late" model 90 and 90A again have push-pull output but with 2 x 47 tubes. See Rider's Philco 3-35 for IF 260 kHz. Applied on models serial B-32001 to B-35000 and above B-53100. They have a 3-gang tuning condenser and only 6 tuned circuits. The same differences can be found for all cabinets, both 90 and 90A: Baby Grand (Cathedral), Lowboy and Highboy (with a stretcher).

The cathedral cabinet is the classic design by Edward L. Coombs, and is similar to the cathedral versions of model 21, 35, 46, and 70.
 

Price in first year of sale 69.00 $
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932
Circuit diagram reference Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)
Mentioned in The Radio Collector's Directory and Price Guide 1921 - 1965
Literature/Schematics (1) Philco Radio 1928-1942 (Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data)
Literature/Schematics (3) Philco Folder 2674.


All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA
Here you find 3732 models, 2105 with images and 3121 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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