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T-7 (T-7-124) Code 124 Philco's first transistor radio

Country:  United States of America (USA)	Manufacturer / Brand:  Philco, Philadelphia Stg. Batt. Co.; USA
Year: 1956/1957	Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors)	7: L-5113L L-5114L L-5114L L-5113L L-5021L L-5028 L-5028 1N527

Main principle	Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)
Tuned circuits	6 AM circuit(s)
Wave bands	Broadcast only (MW).
Details
Power type and voltage	Dry Batteries / 3 Volt
Loudspeaker	Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Radiomuseum.org	Model: T-7 Code 124 [Philco's first transistor radio] - Philco, Philadelphia Stg. Batt
Material	Plastics (no bakelite or catalin)
Shape	Very small Portable or Pocket-Set (Handheld) < 8 inch.
Dimensions (WHD)	7 x 1.75 x 4.25 inch / 178 x 44 x 108 mm
Notes	The Philco model T-7 series includes Philco's first transistor radio. The first version, model T-7 Code 124, was introduced in 1956 for the 1957 model year, and was followed by T-7 Code 126, which is identical in design except for slight circuit changes and one different transistor for the audio driver. Both of these versions have a painted metal perforated grill which is large enough and soft enough that the owner's thumbs and fingers could dent it just by picking it up. Model T-7X (also marked Code 128) was introduced in 1957 for the 1958 model year, and had an improved case with more durable plastic louvers instead of the perforated metal grill.
External source of data	Ernst Erb
Circuit diagram reference	Beitman Radio Diagrams Vol. 17, 1957
Mentioned in	Philco Home Radio Yearbook 1957; SAMS set 347 folder 11
Literature/Schematics (1)	Antique Radio Magazine n.59, February 2004, page 57. Article written in Italian and English.
Literature/Schematics (2)	Photofact Folder, Howard W. SAMS (Set 347 Folder 11 Date 2-57)
Literature/Schematics (3)	Silicon Chip February 2015, page 94.

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All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA
Here you find 3745 models, 2123 with images and 3137 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.

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