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Kirt Blattenberger (KB3UON)

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RCA Victor "High-Fidelity Electrola," Model R-99
Radio Service Data Sheet
December 1936 Radio-Craft

December 1936 Radio-Craft

December 1936 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

In the R-99, a new magnetic pickup is used; the magnet is welded to the pole-pieces; the short, light, centered armature has a viscoloid block attached to the center as a "mechanical filter," to make the frequency response more uniform. It can be removed and a new one fastened in place by heat, best applied with a special-tip soldering iron. The pickup feeds into a compensator pack with filters to correct the frequency response; the output, through the volume control, is divided between V1. the "expander," and V5, the "expander-amplifier.

Amplification is continued through the driver tube V2, impedance-capacity coupled to the primary of its output transformer to increase fidelity, since no plate current flows in the primary. The tone control R1 (incorporated in the switch) across the push-pull stage (V3- V4) permits the user to suit his personal preference in the output. The undistorted output (class A push-pull) of this 3-stage amplifier is rated at 12 W.

RCA Victor "High-Fidelity Electrola," Model R-99

RCA Victor "High-Fidelity Electrola," Model R-99 Radio Service Data Sheet, December 1936, Radio-Craft - RF Cafe

 

 

Posted May 25, 2016


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.

withwave microwave devices - RF Cafe

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright:
1996 - 2024

Webmaster:

Kirt Blattenberger,

BSEE | KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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