87A Chassis Only

87A Chassis Only; Patterson Radio Corp (ID = 1630575) Radio
87A Chassis Only; Patterson Radio Corp (ID = 1630576) Radio
87A Chassis Only; Patterson Radio Corp (ID = 1630288) Radio 87A Chassis Only; Patterson Radio Corp (ID = 1630291) Radio
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87A Chassis Only; Patterson Radio Corp (ID = 1630288) Radio
Patterson Radio Corp: 87A Chassis Only [Radio] ID = 1630288 725x933
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For model 87A Chassis Only, Patterson Radio Corp.; Los Angeles
Country:  United States of America (USA)
Manufacturer / Brand:  Patterson Radio Corp.; Los Angeles
Year: 1937 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 8: 6K7 6A8 6K7 6K7 6G5 6Q7 6F6 5X3
Main principle Superhet with RF-stage; ZF/IF 465 kHz; 2 AF stage(s)
Tuned circuits 9 AM circuit(s)
Wave bands Broadcast plus more than 2 Short Wave bands.
Power type and voltage Alternating Current supply (AC) / 110-125; 220-250 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 12 inch = 30.5 cm
Power out 4 W (unknown quality)
from Model: 87A Chassis Only - Patterson Radio Corp.; Los
Material Metal case
Shape Chassis only or for «building in»

This model is a chassis and 12" speaker sold without a cabinet. It was also used in the Patterson model 90.  It had three bands covering 15 to 550 meters, with an optional band covering 750 to 2300 meters. It is equipped with a tuning eye tube. It as advertised as being "climate proof," with all transformers, coils, and condensers (capacitors) vacuum impregnated. A high fidelity switch broadens the response curves of the intermediate frequency transformers.

This chassis is the same as the 87 chassis except that this chassis has a 12" speaker while the 87 chassis has a 8" speaker.

There is a tube lineup conflict between Riders and a Patterson advertising brochure, with the  Riders showing the rectifier tube as a 4 pin 5X3 while the brochure showing an octal 5Y4G.  Also, the brochure states that all tubes are the new "G" type tubes (6K7G, 6A8G, etc..) while Riders does not show the G tubes in the schematic. The model reflects the Riders tube lineup.

Price in first year of sale 67.50 USD
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 8 = 1937 and before
Mentioned in Rider's 8-7, 8-8

All listed radios etc. from Patterson Radio Corp.; Los Angeles
Here you find 111 models, 43 with images and 66 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.