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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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Philco Model 59, 4-Tube A.C. Midget Superheterodyne Receiver Radio Service Data Sheet
April 1936 Radio-Craft

April 1936 Radio-Craft

[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 Philco Model 59, 4-tube AC Midget 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.

Philco Model 59, 4-Tube A.C. Midget Superheterodyne Receiver Radio Service Data Sheet

(Broadcast band; police calls on lowest band; high sensitivity; high power output for its size.)

This midget superheterodyne operates only on 105-125 V. A.C. Total power consumption is 52 W. When tuning the set, use an accurate signal generator. To adjust I.F.T., remove cap lead of VI and attach generator lead in its place. Set volume control at full-on position and receiver dial at 600, and set C1 and C2 for maximum output. Next replace cap on VI, and set receiver tuning dial so that condenser plates are just starting to mesh. Set signal generator at 1,400 kc. and tune in the signal by means of condensers C3 and C4. Replace the dial pointer in the proper position. An output meter should be attached to the primary of the output transformer.

The final adjustment must be made with the sensitivity control condenser, C5. With the set connected to an antenna, tune in a station at about 130 on the dial. With a screwdriver, turn the small fibre hex-head screw which is located at the back of the chassis directly below the antenna and ground terminals. until the set squeals (circuit oscillates). Then turn the hex-screw 1/4 -turn back until the oscillation stops. Tune in other stations at all parts of the dial to make certain that there is no squeal or oscillation at any point. If the tube V2 is replaced it will be necessary to readjust condenser C5.

Voltages are given in the following table:

Above voltages are taken with a line supply voltage of 115 V. They should be taken from the underside of the chassis using test prods and a suitable A.C. voltmeter for the filaments and a high-resistance, multi-range D.C. instrument for all other readings. The volume control is set at maximum and the station selector at the low-frequency end of the band. Readings taken with a plug-in adapter will not be satisfactory.

The following table gives the color code of the power transformer:

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 227 Radio Service Data Sheets as of December 28, 2020.

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Philco Model 59, 4-Tube A.C. Midget Superheterodyne Receiver Radio Service Data SheetApril 1936 Radio-Craft

Philco Model 59, 4-Tube A.C. Midget Superheterodyne Receiver Radio Service Data Sheet

Philco Model 59, 4-Tube A.C. Midget Superheterodyne Receiver Radio Service Data Sheet
April 1936 Radio-Craft