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Mantola Models 92505, 92506 Schematic & Parts List
July 1948 Radio News

July 1948 Radio News

July 1948 Radio & Television News Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio & Television News, published 1919-1959. All copyrights hereby acknowledged.

Mantola Model 92506 (radiomuseum.com) - RF CafeAccording to the Radio Museum website, B.F. Goodrich, of Akron, Ohio, manufactured the Mantola line of radio receivers. It was evidently a low quality, low price, short-lived run of models. The simplicity of the schematic shows the low parts count. A lack of multipole filter circuits likely means selectivity was fairly marginal. One good feature is that unlike many earlier radios and TVs, the AC line connection is DC-isolated through a 150 kΩ resistor (R13). Look at the schematics of older sets and it is not uncommon to see one line of the AC supply tied directly to the metal electronics chassis. An isolation transformer right at the input is the safest way to do it.

Schematics & Parts List

Mantola Models 92505, 92506 Schematic, July 1948 Radio News - RF Cafe

Mantola Models 92505, 92506 Parts List, July 1948 Radio News - RF Cafe


Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of December 28, 2020.

 

 

Posted September 30, 2020
(updated from original post on 6/17/2015)

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