| Title | File |
|---|---|
| Acro Products pamphlet (Ultra-Linear / Acrosound outputs) | AcroSound.pdf |
| Acro Products Acrosound output transformers (215 Arch St., Philadelphia) | AcroTX.pdf |
| Altec Lansing studio transformers, 20–20,000 Hz ±1 dB (TB-103 / TB-105 inputs) | Altec-Transformers.pdf |
| Altec Service speech/output/matching transformer charts (TB/TBB/TL/TM, WE-A equivalents) plus ERPI Wide Range power transformer bulletin, July 2, 1936 | Altec_Service_WE_ERPI_Transformer_Data.pdf |
| AmerTran (American Transformer Company) — Transformers for Audio Amplification and Transmission, 1935 | Amertran-1935.pdf |
| Audio Development Company Catalog # 46C | ADC_Catalog_46C.pdf |
| Audio Development Company Catalog # 49A | ADC_Transformers_Catalog_49A.pdf |
| Chicago New Equipment Transformers Catalog CT-40 — Essex Wire / Chicago Transformer Division, 3501 Addison St. | Chicago-CT-40.pdf |
| Chicago Transformers Catalog # CT-47 | Chicago CT-47.pdf |
| Chicago Transformers Catalog # CT-652 | Chicago-CT-652.pdf |
| Chicago Replacement Transformers Catalog R-449 — Essex Wire / Chicago Transformer Division | Chicago-R449.pdf |
| Chicago Standard Transformer Catalog CT8-58 (1958) — hermetically sealed, commercial-grade control/power transformers and filter reactors | Chicago-Transformers-Catalog-ctc-1958.pdf |
| Crest Transformers Catalog | Crest-Trx.pdf |
| Dynaco Super Fidelity output transformers — Hafler para-coupled windings, patent 2,815,408 | DynacoTX.pdf |
| Freed Catalog No. 545 — transformers, toroids, filters, amplifiers (Weirfield St., Brooklyn) | FREED-545-Cat.pdf |
| Freed Catalog # 5600 | Freed catalog-5600.pdf |
| Freed Catalog # 591 | Freed-591.pdf |
| Freed-631 Catalog | Freed-631-Cat.pdf |
| Freed Transformers catalog (Cat. 2) — 72 Spring Street, New York 12 | FREED-Cat2.pdf |
| Freed Transformer Co. catalog — transformers and lab instruments (VTVM 1040, Q indicator 1030, comparison bridge) | Freed_Transformer_Catalog.pdf |
| Hammond Catalogue 65 — Transformers, Electronic Equipment (Hammond Manufacturing Co. Ltd., Guelph, Ontario) | Hammond-65-Cat.pdf |
| Hammond Catalogue 67, August 1956 — transformers and fabricated metal parts (Guelph, Ontario) | Hammond-67-1956.pdf |
| Jefferson Radio Transformers Catalog 371-R (1937) | Jefferson_Radio_Transformers_Catalog_371-R_1937.pdf |
| Kenyon Bulletin C-2, The Silver Group, 1935 — PA and amateur transformers and reactors (840 Barry St.) | Kenyon-C2-1935-Silver.pdf |
| Kenyon Catalog Number Two (1936) | Kenyon_Catalog_Number_Two_1936.pdf |
| Kenyon Transformers Catalog 1940 | Kenyon1940.pdf |
| Kenyon Transformers Catalog 1945 | Kenyon1945.pdf |
| Kenyon Universal Replacement Transformers Catalog R-3 (revised; prices Dec 1938) — T-line power, filament, chokes | Kenyon-Universal-R-3.pdf |
| Kenyon Quality Transformers, 1950 edition | Kenyon-1950.pdf |
| Kenyon Quality Transformers T-line catalog, c. 1955 | Kenyon-1955.pdf |
| Kenyon Twins — M Line (MIL-T-27) and C Line (civilian), 840 Barry St. | Kenyon-Twins.pdf |
| Luxman Electronic Parts | Lux Electronic Parts Part 1.pdf Lux Electronic Parts Part 2.pdf |
| Luxman power transformers (1970) | LUX_power_trans1970nen.pdf |
| Peerless Transformers Bulletin 430 — radio, sound, public address, television (Radio & Television Equipment Co., Santa Ana) | Peerless-430.pdf |
| Peerless Transformers Catalog Bulletin # 431 | Peerless-Bull431.pdf |
| Peerless Electrical Products transformer catalog 1950-1 (Altec Lansing) | Peerless-1950-Cat.pdf |
| Peerless Electrical Products transformer catalog, 1953 (Altec Lansing division) | Peerless-1953-Cat.pdf |
| Peerless Electrical Products transformers catalog, 1960s (Altec Lansing division) | Peerless-1960s-Cat.pdf |
| Raytheon Transformers and Reactors | Raytheon-Trx.pdf |
| Tamura Transformers | Tamura96.pdf (Japanese) Tamura_Audio_Transformers_1996_English_Translation.pdf |
| Tango Transformers | Tango_Transformer.pdf (Japanese) TANGO_Transformers_English_Catalog.pdf |
| Thordarson 341 Amateur Transformer Guide | Thordarson_341_Amateur_Transformer_Guide.pdf |
| Thordarson 346-A Sound Amplifier Manual | Thordarson_346-A_Sound_Amplifier_Manual.pdf |
| Thordarson 400-C | Thordarson400C.pdf |
| Thordarson 400-I Replacement Transformer Encyclopedia | Thordarson_400-I_Replacement_Transformer_Encyclopedia.pdf |
| Triad Transformers Catalog 1971 & 72 | Triad 71&72.pdf |
| UTC Varitap VR-1 Bulletin — universal duplicate transformers (72–78 Spring Street) | UTC-Varitap.pdf |
| UTC Broadcast Components | UTC-Broadcast-Components.pdf |
| UTC 1934 Transformers Catalog Bulletin U1100A | UTC-Bulletin-U1100A-1934.pdf |
| UTC Transmitter and Public Address Manual, 1936 | UTC-1936.pdf |
| UTC Transformers Bulletin U1100C, 1936 (Linear Standard catalog) | UTC-U1100C-Transformers-1936.pdf |
| UTC Bulletin U1100C | UTC_Bulletin_U1100C.pdf |
| UTC Bulletin PS-200 | UTC_Bulletin_PS-200.pdf |
| UTC Transformers Catalog PS-402 | PS-402.pdf |
| UTC PS-403 Transformers Catalog | UTCPS-403.pdf |
| UTC PS-404 Transformers Catalog | UTCPS-404.pdf |
| UTC 1947 # PS-407 Transformers Catalog | UTC-1947, PS-407.pdf |
| UTC 1949 Transformers Catalog # PS-409 | UTC-PS-409.pdf |
| UTC 1954 Catalog B — transformers, reactors, and filters (150 Varick Street) | UTC-1954-Catalog-B.pdf |
| UTC Deci-Ouncer DOTs — miniature transistor transformers (150 Varick Street) | UTC-Deci-Ouncer.pdf |
| UTC 1958 Transformers Catalog | UTC-1958Cat.pdf |
| UTC Transformers Catalog # 510 | UTC-Cat-510.pdf |
| UTC 1959/1960 Transformers Catalog | UTC-G1959-60.pdf |
| UTC 1959 Filters & HI-Q Coils Catalog | UTC-HIQ-1959.pdf |
| UTC Transformers Catalog 1962–1963 | UTC_Transformers_Catalog_1962-1963.pdf |
| UTC 1969 Transformers Catalog | UTC-1969.pdf |
| UTC-01 | UTC01/ |
| Western Electric Transformers General Bulletin, 1931 | westernEtrxdata.pdf |
| Western Electric Loudspeaker Autotransformers 25A, 26A, 27A | WE-AutoTrans.pdf |
| Western Electric / Bell System Transmission Transformers, 1958 | WE-Transformers_1958.pdf |
| Western Electric / Bell System Transmission Transformers, 1964 | WE_Transformers_1964.pdf |
| Title | File |
|---|---|
| Altec Planning Guide for Architects and Engineers | Altec_Planning_Guide_Engineered_Sound_Systems.pdf |
| Altec Engineered Sound Products | Altec_Engineered_Sound_Products.pdf |
| Altec Lansing sound equipment catalog, 1950 — Graybar, Western Electric, and Altec Lansing | Altec-Western-Electric-1950.pdf |
| Altec Lansing Engineering News — Prestige photo folders (Technical Letters; 1515 S. Manchester Ave., Anaheim) | Altec-Engineering-News.pdf |
| Altec Lansing Audio Equipment Catalog, 1965 — Courtesy of Steam Powered Radio. | Altec_Lansing_1965_Audio_Equipment_Catalog.pdf |
| Bogen Blue Book of Sound Equipment Catalog P1151A — amplifiers, systems, phonographs, accessories (David Bogen Co., New York) | Bogen-P1151A-Cat.pdf |
| Eico 1961 Kits & Wired catalog — Medalist Series stereo/mono hi-fi, test instruments, ham, CB (MC-561-1) | Eico-1961-Cat.pdf |
| Eico 1964 Catalog | Eico-1964-Cat.pdf |
| Eico 1967 Catalog | Eico-1967-Cat.pdf |
| Eico 1972 Catalog | Eico-1972-Cat.pdf |
| Electro-Voice General Catalog 139 (c. 1960) — microphones, PA horns, hi-fi speakers, Buchanan, Michigan | Electro-Voice-Catalog-139.pdf |
| Freed Precision Laboratory Test Instruments — Q indicator, bridges, VTVM, distortion meter, decades (Weirfield St.) | FREED-TestEquip.pdf |
| GE Audio Data Book (ECI-180) — broadcast/audio amplifiers, pads, and conversion tables (sheets dated through 1958) | GE-Audio-Cat-1955.pdf |
| Hammond Manufacturing Classic Transformers & Enclosures | Hammond-Classic-Transformers.pdf |
| Jensen Loud Speaker Catalog, 1948 | Jensen_1948_Loudspeaker_Catalog.pdf |
| Jensen Catalog 1011 — Fine Acoustic Equipment | Jensen-1011-Cat.pdf |
| Lafayette Catalog No. 454 — High Fidelity Music System Components (c. 1954) | Lafayette-454-Cat.pdf |
| RCA Acoustically-Engineered Sound Systems catalog — theatres, broadcast, and commercial PA (Hackmann Music & Sound Service imprint) | RCA-Eng-Sys.pdf |
| RCA Test Equipment Catalog | RCA-Test Equipment.pdf |
| RCA Sound Products Catalog 217 — sound and picture equipment (Camden) | RCA-Sound-Products-217.pdf |
| University Product Catalog | University Products.pdf |
| University Sound / Altec Sound Products GSA Federal Supply Schedule price list — contract GS-00S-07116, Jul 1 1976–Mar 31 1977 (FSC 5830) | UniversitySound-GSA-1976.pdf |
| UTC Linear Standard 20-watt amplifier kit (150 Varick Street) | UTC-20watt-Kit.pdf |
| UTC Beam Power Amplifiers Catalog | UTCAmplifiers.pdf |
| Western Electric Broadcast Equipment Catalog, 1948 — Courtesy of Steam Powered Radio. | Western-Electric-Broadcast-1948.pdf |
| Westinghouse Instruments Catalog #43 | Westinghouse-Inst.pdf |
| Weston Test Equipment Catalog R36-A | Weston-2.pdf |
| Weston-980 Catalog | Weston-980.pdf |
| Weston Portable Instruments Catalog | Weston-Catalog.pdf |
| Title | File |
|---|---|
| Altec A-287W 250 W Class B rack amplifier (2×805, 2×866-A); 100–10,000 Hz, driven by A-127-B / A-255-A | Altec287W.pdf |
| Altec 406B, 414A, 416A, 515B L.F. loudspeakers | Altec_406B_414A_416A_515B_LF_Loudspeakers.pdf |
| Altec 1976 GSA / Voice of the Theatre price list | Altec_1976_GSA_Voice_of_the_Theatre.pdf |
| Altec multicellular horns AL-1434 — exponential cells for theatres/stadia; 288 indoor, 290/730 outdoor, used with 416A/515B in VOTT | Altec_Multicellular_Horns_AL-1434.pdf |
| Altec Voice of the Theatre Catalog, 1983 | Altec_1983_Voice_of_the_Theatre_Catalog.pdf |
| Chicago Standard 100-watt power amplifier — A. Kenneth Olson, Radio & Television News, Nov 1955 (Tung-Sol 6550, PCR-300 / BO-14) | Chicago-100W-Amp.pdf |
| DuKane Model 1A831 300-Watt Amplifier | DuKane-1A831-Amplifier.pdf |
| Edison Model 501 hermetically sealed thermal time-delay relay (explosion-proof, chatter-proof, patent 2,102,407) | Edison501.pdf |
| Eico-1030 Power Supply operating manual | Eico-1030-PwrSup.pdf |
| Gotham PFB-150WD Power Amplifier | Gotham_PFB-150WD_Power_Amplifier.pdf |
| General Radio Experimenter, October 1951 | GR Exp 1951_10.pdf |
| McIntosh MI-75 75-watt industrial power amplifier owners manual | McIntosh-MI-75.pdf |
| McIntosh MI-200 Amplifier instruction manual | McIntosh-MI-200.pdf |
| Miller & Kreisel M&K MX-2000 subwoofer brochures | M&K.pdf |
| Racon portable horns, prices effective December 1, 1931 (18 Washington Place, New York) | Racon-1931.pdf |
| RCA MI-12188 150-Watt Power Amplifier instructions | RCA_MI-12188_150-Watt_Power_Amplifier_Instructions.pdf |
| Technics SH-F101 electronically tuned indoor FM dipole, 88–108 MHz, 75 Ω, figure-8 pattern | Technics-SH-F101.pdf |
| Technics SH-F101 FM Wing Antenna operating instructions | Technics-SH-F101-Instructions.pdf |
| University Loudspeakers “Sound Unlimited” / Progressive Speaker Expansion (Oct. 1954, Form 78N32) — Diffusicone, Cobreflex, C15W, HF-206, Dean/Classic enclosures | University_Loudspeakers_Sound_Unlimited_PSE_1954.pdf |
| Weston Model 981 Type 3 tubechecker instructions | Weston-981-Type-3.pdf |
| UTC reactance–frequency chart — transformer components | UTC-Chart.pdf |
| UTC Type CG transformer terminal arrangements | UTC-CG-TermAr.pdf |
| UTC Industrial Components Catalog | UTC-Components.pdf |
| UTC Type S transformer terminal arrangements | UTC-S-Term-Arr.pdf |
| UTC Varimatch transformers terminal arrangements | UTC-Var-Ter-Ar.pdf |
Portraits of inventors and company founders. Open the full gallery with notes.
Amar Bose
Arthur Atwater Kent
Avery Fisher
Bernard Kardon
Bob Carver
Charlie Kittleson & Joe Roberts
David Bogen
David Hafler
D.T.N. Williamson
Eric Barbour
Etsuro Nakamichi
Flurrydyne staff, 1965
Frank McIntosh
Gene Czerwinski
James B. Lansing
Joe Roberts
John Atwood
Martin Kiebert
Matthew Polk
Nelson Pass
Paul W. Klipsch
Peter L. Jensen
Rudy Bozak
Sidney Harman
Stan White
| Title | File |
|---|---|
| Antique Radios — vintage radio and electronics forums | https://antiqueradios.com/forums/ |
| Antique Wireless Association — museum campus and facilities | https://www.antiquewireless.org/homepage/campus-and-facilities-2/ |
| AudioKarma — vintage audio forums | https://audiokarma.org/forums/ |
| Audiophool — vintage electronics, tubes, manuals and Rochester-made gear | https://www.audiophool.com/ |
| BAMA — Boat Anchor Manual Archive | https://bama.edebris.com/ |
| Bunker of Doom — antique transformer and parts catalogs | https://www.bunkerofdoom.com/xfm/ |
| DIY Audio — DIY audio community forums | https://www.diyaudio.com/community/ |
| HiFi Haven — vintage and DIY audio forum | https://hifihaven.org/index.php |
| RadioMuseum — radio, tube, and electronics collector database | https://www.radiomuseum.org/ |
| Steam Powered Radio — broadcast equipment manuals, catalogs, and station history | https://steampoweredradio.com/ |
| Triad Historical Archive — transformer catalogs and company history | https://triadtransformer.com/ |
| Western Electric Library — technical documents, tube and audio papers | https://www.westernelectric.com/library#technical |
| World Radio History — broadcast, catalog, and magazine archive | https://www.worldradiohistory.com/index.htm |
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