Columbia C31 Schematic purchase

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Schematics sent by Email £1.80 (~ $2.20 or €2.10)

Saturday 9/5/2026 14:20
I am away until Thursday evening 21/12/2023 I cannot send any schematics marked TO SCAN until home, pre-scanned ones will be sent probably in the evening UK time
Columbia C31 (Rider : - 2 P: 1)
£1.80 (~ $2.20 or €2.10)
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The schematic will be taken from Rider-Vol 02-1933

Rider-Vol 02-1933 preview

Columbia C31 Specification spec data sheet

These notes are automatically scraped from Google, Bing, Yahoo, Yandex
by an Artificially (not so) Intelligent algorithm
CountryUSA
ManufacturerColumbia Phonograph, American / Volta Graphophone Company; USA
Alternative Name American Graphophone || Columbia Recording
ModelC-31 - Columbia Phonograph, American
Year: 1931Broadcast Receiver
Valves5: 51 51 24 47 80
TechnologyTRF without regeneration
Tuned Circuits3 AM circuit(s)
Wave BandsBroadcast only (MW).
Power TypeAC
SourceBook: Gernsback Vol: 2 Page: 209
SourceBook: Rider Vol: 2 Page: 1