International Model 66 and 666, 6-Tube Superhet Radio Service Data Sheet
April 1936 Radio-Craft

April 1936 Radio-Craft

April 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.

This Radio Service Data Sheet covers the International Model 66 and 666, superheterodyne receiver. Most - if not all - electronics servicemen had subscriptions to these magazines because they were a ready source of not just these service sheets, but because of the extensive articles offering advice on servicing radios and televisions. In fact, many electronics manufacturers had a policy of supplying service data only to bona fide shops. A large list is included at the bottom of the page of similar documents from vintage receiver schematics, troubleshooting tips, and alignment procedures. They were originally published in magazines like Radio-Craft, Radio and Television News, Radio News, etc. I scan and post them for the benefit of hobbyists who restore and service vintage electronics equipment.

Ward 10-Tube All-Wave High-Fidelity Superhet, Series ODM Radio Service Data Sheet

 Radio Service Data Sheet, April 1936 Radio-Craft - RF Cafe

Alignment should be made by use of output meter and service oscillator. Set latter at 448 kc, and attach lead to set antenna connection. Align I.F.T. 1, then I.F.T. 2 for maximum output. Place band switch at broadcast position, turn set to 1,400 kc. and feed a very weak 1,400 kc. signal from service oscillator to antenna. Adjust trimmers on gang condenser for best response. Adjustment at 1,000 and 600 kc. must be made by carefully bending plates of tuning condenser. Socket voltages are as below. Line voltage should be 118 V., and volume control full on. A variation of 10 per cent is allowable. All measurements made from tube prong to circuit ground. No alignment is necessary for the short­wave band since this is accomplished automatically. As a rule poor sensitivity is a sign of incorrect I.F. alignment, which should be carefully checked in such cases.



Posted June 17, 2015

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 220 Radio Service Data Sheets as of February 2, 2018.