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90A Highboy Middle

90A Highboy; Philco, Philadelphia (ID = 509076) Radio
90A Highboy; Philco, Philadelphia (ID = 509077) Radio
90A Highboy; Philco, Philadelphia (ID = 565516) Radio 90A Highboy; Philco, Philadelphia (ID = 1330243) Radio
90A Highboy; Philco, Philadelphia (ID = 1484453) Radio 90A Highboy; Philco, Philadelphia (ID = 1484454) Radio
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90A Highboy; Philco, Philadelphia (ID = 565516) Radio
Philco, Philadelphia: 90A Highboy [Radio] ID = 565516 560x465
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For model 90A Highboy Middle, Philco, Philadelphia Stg. Batt. Co.; USA:
Philco_90A-Highboy-Middle_Ebay seller mittenpaw.
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).
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 Model: 90A Highboy [Middle] - Philco, Philadelphia Stg. Batt
Material Wooden case
Shape Console, Highboy (legs > 50 %).

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 109.00 $
Source of data Philco Radio 1928-1942
Circuit diagram reference Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)
Literature/Schematics (1) Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data
Literature/Schematics (3) Philco Folder 2674.

Model page created by Thomas Albrecht. See "Data change" for further contributors.

All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA
Here you find 3737 models, 2110 with images and 3134 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.