Philco Model 15 Series, 11-Tube Superheterodyne Chassis
Radio Service Data Sheet
August 1932 Radio-Craft

August 1932 Radio-Craft [Table of Contents] People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.

At least for now, I am going to only scan and post Radio Service Data Sheets like this one featuring the Philco Model 15 Series, 11-Tube Superheterodyne Chassis in graphical format, and run OCR on them to separate the textual content and make it searchable. There are still many people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. I will keep a running list of all data sheets to facilitate a search. The hilco Model 15 Series, 11-Tube Superheterodyne photo was found on the PhilcoRadio.com website.

Philco Model 15 Series, 11-Tube Superheterodyne Chassis Radio Service Data Sheet

(Used in Models 15X and 15DX receivers; and includes inclined sounding board, twin reproducers, tone control, A.V.C., visual tuning, local-distance switch.)

A feature of this chassis design is the exceptionally fine quality of the reproduction. Note that tubes of the 6.3-volt or "automotive" type are used in this ultra-modern receiver, a product of the Philco Radio & Television Corp. The following quotation is of particular interest.

"In efficiency, in economy of current and space, in uniformity, in freedom from trouble and in all-around performance, the new Philco 6.3·volt universal-service tubes are superior to any tubes that we know of, past or present.

"We will standardize on 6.3-volt heater type tubes, since their use permits application to automotive receivers and D.C. sets, as well as to A.C. instruments; thus, all new developments in future Philco tubes will be immediately available for all these classes of service."

Following is a list of the features of this set, as furnished by the factory: Inclined sounding board, twin-reproducers, A. V.C., automatic tuning silencer, distance switch, illuminated grille, tone control, shadow tuning, glowing-arrow station finder, station-recording type of dial.

The resistors in the Model 15 chassis should measure as follows: R2, R17, 10,000 ohms; R3, R5, R18, .49-meg.; R4, 0.16-meg.; R6, 51,000 ohms; R7, 200 ohms;: R8, R14 R16, 1.0 meg.; R, 13,000 ohms: R10, 1,000 ohms; R11, 99,000 ohms; R12, 0.25-meg. (dotted; see text); R13, R19, 5,000 ohms; R15, 25,000 ohms; R20, 0.24-meg.; R21, R22, 50 ohms; R23, 205 ohms.

Condensers C1 to C9, tuning or trimming condensers. Condensers C10, C22, C23, are 110 mmf. units; C11, C12, C13, C18, C19, 0.05-mf.; C14, C17, 0.09-mf.; C15, C24, C25, 0.25-mf.; C16, 35 mmf.; C20, 1.0 mf.; C21, C27, 0.01-mf.; C26, C31, C33, 0.5-mf.; C28, C29, C30, tone control condensers; C32, 0.002-mf. (dotted; see text); C34. C38, C39, 0.015-mf.; C35, 0.18-mf.; C36, C37, 6 mf. (electrolytic); C5.A, 700 mmf.

The reproducer system of this receiver deserves special mention. Due to the fact that there are two separate dynamic reproducers operating from a single receiver output, it is absolutely essential that the instruments be correctly "poled" - that is, the field and voice coils must be connected so that the correct "phase" relation is maintained between the two units. (Both diaphragms moving in or out at the same time.) For this reason a detail illustration of the reproducer leads, showing their color code and connections, is reproduced in this Data Sheet.

Chasses stamped at rear with a circle around Nos. 20 and 21 must have R12 and C32 added to reduce distortion due to powerful local stations: Nos. 22 and 23 have C32 but may require R12 ; subsequent chasses are equipped with both.

"Both speakers have identically the same frequency response characteristics," states the manufacturer. The two reproducers arc used to obtain more uniform sound distribution. An echo-absorbing screen at the rear of the cabinet prevents echo and blur - and tends to increase front-projected sound volume .

The power rating of the set is 115 watts. The tubes in the Model 15 chassis are very economical in their filament-current requirements. The types '37 and 44 tubes consume only 0.3-A; the 42's (the output pentodes), 0.7-A.; the '80, 2. A. The filaments of all of these tubes, except the '80, are rated at 6.3 V.; the '80, 5 volts.

With an A.C. line potential of 115 volts, volume control at maximum, with the station selector turned to the low-frequency end and the power switch in the "middle" position, the following readings are normal: Plate potential (measured to cathode), V1, 165 volts; V2, V4, 250 volts; V3, 60 volts; V5, 275 volts; V6, zero; V7, 75 volts; V8, 100 volts; V9, V10, 255 volts; V11, 320 (per plate). Screen-grid (to cathode), V1, 55 volts; V2, V4, V5, 90 volts; V9, V10, 270 volts. Control-grid (to cathode), V1, V3, V9, V10, 15 volts: V2, V4, 0.85-volt; V5, 3.3 volts; V6, V8, 0.2-volt; V7, 0.4-volt. Cathode (to filament), V1, 30 volts; V2 to V9, 10 volts; V10, 15 volts; V2, V4, 0.85- volt; V5, 3.3 volts; V6, V8, 0.2-volt; V7, 0.4-volt. Cathode (to filament), V1, 30 volts; V2 to V9, 10 volts; V10, V11, 15 volts.

 

 

Posted July 27, 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.

Crosley Model AC-7 and AC-7C Westinghouse "Columnaire" Models WR-8 and WR-8-R (Remote Control) Characteristics of Metal Tubes - and Other "Octal" (8-Prong) Base Types Kolster K20, K22, K25, K27 and K37 Six-Tube Receivers Stromberg-Carlson Nos. 62 and 63, 8-Tube High-Fidelity Chassis RCA Model 103, 4-Tube A.C. Compact Dual-Wave FADA "Special" Model 265-A and FADA "7" Model 475-A General Electric Model C-62 6-Tube Battery Emerson 5A Automotive Zenith 666 Automotive Motorola 100 Automotive Crosley Roamio 4-A-1 Automotive American-Bosch 524A Automotive Crosley Model 1316 (in Model 167 Console) RCA Victor "High-Fidelity Electrola," Model R-99 AMRAD Model 81 ("Bel Canto" Series) Receiver Fada 103 Fadalette, Stewart-Warner Series 108, DeWald 54 Dynette Sets RCA Victor R-27 and Philco 53 Ultra-Midget A.C.-D.C. Radio Receivers Majestic Models Fairfax and Sheffield 8-Tube Stromberg-Carlson No. 29, 9-Tube Superhet International Kadette Model 400 4-Tube Battery-Operated Superhet RCA Victor Model 5M 5-Tube Auto Superhet Majestic Model 11 Short-Wave Converter Silver-Marshall Model 727-DC Battery-Operated Superheterodyne RCA Victor Model VHR-307 Home Recording - Phono-Radio Combination Delco 32-Volt Radio Receiver Chassis Models RA-3, RB-3 and RC-3 Majestic Chassis Models 380 A.C. T.R.F., and 400 A.C.-D.C. Superheterodyne General Motors S1A, S1B Admiral Model 7C63, Chassis 7C1 Westinghouse Model H-133 Arvin Models 150TC, 151TC Kadette Model 90 Duplex RCA-Victor "Magic Brain" Model 281 Grunow 11A Chassis 11-Tube All-Wave Superheterodyne Sears, Roebuck & Co., Silvertone "Rocket" Models 6110 and 6111 General Electric Model GD-52 Zenith Models 6D302, 6D311, 6D326, 6D336, 6D360 Allied Radio, Knight Model E10913 Arvin Model 140P Emerson Models 501, 502, 504 Crosley Model 56TD-W Hoffman Model A500 Stewart-Warner Model 9003-B Zenith Models 6D014, 6D029 Coronet Model C-2 Sparton Models 7-46, 7-46PA, 8-46, 8-46PA Stewart-Warner Models 9001-C, D, E, F Zenith Models 5D011-5D027 Bendix Models 636A, C, D ECA Model 108 International Model 66 and 666, 6-Tube Superhet Ford-Philco Radio, Model FT9, 6-Tube Auto-Radio Receiver Howard Explorer Model W Deluxe 19 Tube All-Wave Superhet RCA Victor Portable Table Electrola Model R-95 Atwater Kent Model 305Z 5-Tube 32 V. D.C. Superhet Kadette Jewel Model 40 Chassis 3-Tube Ultra-Midget Receivers General Electric Model N-60 6-Tube Auto Superheterodyne Sparton Model 40 6-Tube T.R.F. Automotive Receiver Clarion "Replacement" Chassis, Model AC-160 A.V.C. Superheterodyne Emerson Models 20A and 25A General Electric K-40A Pilot Model B-2 RCA-Victor Radiola Model M-30 Automotive Radio Motovox Models 10A All-Electric and 10E Battery-Operated "Moto-Tetradynes" Kennedy Superheterodyne Short-Wave Converter RCA Victor Model R-78 B1-Acoustic 12-Tube Philco Model 15 Series, 11-Tube Superheterodyne Chassis Zenith Challenger Model 740

Atwater Kent Models 30, 33, 35, 48 and 49 Crosley Model 120 Senior Superheterodyne (Pliodynatron) Chassis Columbia Screen-Grid 8 Receiver General Electric Models A82 and A87, 8-Metal-Tube All-Wave A.C. Superhet. Colonial 31 and 32 D.C. Zenith 5-Tube Triple-Wave Chassis nos. 5508 and 5509 Remler Model 46 ("Scottie") General Electric FA-60 and FA-61 Stewart-Warner Series 900 Howard Model B-5 (715), Series 1 and 2 (Sheaffer Radio-Clock-Pen Desk Set) Ford-Philco Car-Radio Models F-1440 and F-1442 Brunswick Model 31 Combination Radio and Panatrope Emerson Models 38, 42 and 49, 6-Tube Dual-Wave (Chassis U6) General Motors Chevrolet No. 601574 Automotive RCA Victor M-104 (and M-108) Automotive Arvin-Ford 17-A Automotive Westinghouse Model WR 207 & WR 208 5-Tube Dual-Band Superheterodyne Radiolas "Super VIII" (AR-810, "Semi-Portable" (AR-812), 24 and 26 Howard Model 45 A. V. C. Majestic Model 25 Galvin Motorola Model 61 Arvin Model 6 Admiral Models 7T06, 7T12 Garod Model 5A1 Hoffman Model A301 Knight Model E10716 Battery Portable Arvin Models 555, 555A, 552N, 552AN Grantline Models 605, 606 Truetone Model D2616 Belmont Model 5D128 Arvin Models 444, 444A International Kadette Model 1019 Stewart-Warner Models 97-561 to 97-569 General Electric Model 280 Zenith Models 5R080, 5R086 Truetone Models D1747, D1748 Crosley Roamio Automotive T.R.F. Models 90, 91, 92 Crosley Roamio Automotive Superheterodyne Models 95, 96 Wells-Gardner Series 062 Emerson Model AZ-196 Belmont Model 5P19 Crosley Model 56FC Emerson Models 507, 509, 518, 522, 535 Garod Model 6AU-1 General Electric Models 219, 202, 221 Crosley "Chairside" Model 567 Belmont Model 408 Battery "Farm" Wards Model 74BR-1055A Farnsworth Models EK-081, EK-082, EK-083, EK-681 Philco Model 200-X Radio Admiral "Aeroscope" Models 161-5L, 162-5L and 163-5L Philco Model 59, 4-Tube A.C. Midget Superheterodyne Zenith Farm Model 6V 27, 6-Tube Superhet Ward 10-Tube All-Wave High-Fidelity Superhet, Series ODM Philco-Packard Deluxe Canadian Westinghouse Model 175 Crosley Model 1155 Philco Models 39 and 39A Arvin Model 35 8-Tube Car-Radio Hetro Air-Ace Series M Westinghouse Models H-161, H-168, H-168A Garod Model 5A4 Arvin Models 152T, 153T Belmont Model 5240 Mantola Models 92505, 92506 General Electric Models 102, 102W, 107, 107W, 114, 114W, 115, 115W Crosley Model 555 (A.F.M.) Crosley Model 515 (Fiver) Crosley Model 425 (Travo) Firestone-Stewart-Warner Model R1332 Fairbanks-Morse Model 81 "Farm" Set Clarion Model 423, 470, 471, 472, 480 International Radio Corp. Model 90 Belmont Model 578 Series A