Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives Magazine Sponsor RF Cafe Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Alliance Test Equipment Centric RF Empower RF ISOTEC Reactel RF Connector Technology San Francisco Circuits Anritsu Amplifier Solutions Anatech Electronics Axiom Test Equipment Conduct RF Copper Mountain Technologies Exodus Advanced Communications Innovative Power Products KR Filters LadyBug Technologies Rigol TotalTemp Technologies Werbel Microwave Windfreak Technologies Wireless Telecom Group Withwave RF Cafe Software Resources Vintage Magazines RF Cafe Software WhoIs entry for RF Cafe.com Thank you for visiting RF Cafe!
Innovative Power Products Passive RF Products - RF Cafe

RF Electronics Shapes, Stencils for Office, Visio by RF Cafe

Windfreak Technologies Frequency Synthesizers - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

Amplifier Solutions Corporation (ASC) - RF Cafe

Sparton Models 566 ("Bluebird" Mirror), 506 and 594 A.C.-D.C. 5-Tube 2-Band Midget Superhet

Radio Service Data Sheet
June 1936 Radio-Craft

June 1936 Radio-Craft

June 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.

Sparton Models 566 ("Bluebird" Mirror) - RF CafeThis 'Bluebird' radio from Sparton has to be one of the most unique models of its era (mid 1930s). A Google search turns up quite a few examples of restored Model 566s. A Radio Service Data Sheet for the Sparton Model 566 appeared in the June 1936 issue of Radio-Craft magazine. It is a 5-tube, 2-band miniature design that operated on either an AC or a DC supply. Tuning covered 172 through 1710 kHz, which is shortwave and AM broadcast. The thumbnail image of the Sparton Model 566 'Bluebird' radio came from the TubeRadioLand.com website, where much more information can be found.

Sparton Models 566 ("Bluebird" Mirror), 506 and 594 A.C.-D.C. 5-Tube 2-Band Midget Super.

Radio Service Data Sheet

Sparton Models 566 ("Bluebird" Mirror), 506 and 594 A.C.-D.C. 5-Tube 2-Band Midget Super. Radio Service Data Sheet, June 1936 Radio-Craft - RF CafeRanges 550 to 6,000 kc, in 2 bands; A.V.C.; illuminated dial; dynamic speaker; tone control.

This A.C.-D.C. compact receiver should be tested for proper voltages at a line potential of about 119 V. The antenna should be dis-connected and the volume control turned on full with the wave-band switch in the short-wave position. A variation of plus or minus 15 per cent is allowable on all readings

All above voltages are measured to ground. Alignment should be made with an oscillator which can cover a range of from 172.5 to 1,710 kc. If the oscillator does not have a 0.1-mf. condenser in the antenna lead, such a condenser should be added. The lead should be connected to the cap of V1, and the other lead grounded to chassis. An output meter must be connected from plate of V4 to ground. Tune service oscillator to 456 kc., turn the set condenser all the way out of mesh, and adjust the I.F. transformer condensers. Set the station selector knob at 540 kc, and make sure the condenser rotor plates mesh evenly with the stator plates. Then align the set at 1,500 kc. after having first set the service oscillator at this frequency. Again align at 900 kc. on the set dial



Posted June 20, 2017

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.


Amplifier Solutions Corporation (ASC) - RF Cafe
Axiom Test Equipment - RF Cafe

withwave microwave devices - RF Cafe

ConductRF Phased Matched RF Cables - RF Cafe