| Section
| Date
| Issue
| Size
| Title
|
| AB22.401.1 | 1953-09-01 | 1 | 285.08 KB | Detection, Location and Correction of Impedance Irregularities in Loaded Exchange Type Cables - General Considerations |
| AB25.176 | 1954-06-01 | 1 | 18.59 MB | Contractual and Coordination Considerations in Connection With Use of Power Line Carrier On Rural Electrification Administration Lines |
| AB43.910-3PT XA | 1950-07-01 | A | 640.60 KB | 500-Type Set Loop Design - Zone 5A Outer Boundary Limits - SxS, Crossbar and CX Dial, #12 Manual 48-Volt Exchanges |
| AB46.024 | 1939-11-01 | 2 | 266.82 KB | 101F Vacuum Tube (Dome) - Low-power, Filamentary Triode |
| AB46.025 | 1939-11-01 | 1 | 241.49 KB | 101FA Vacuum Tube - Low-power, Filamentary Triode |
| AB46.030 | 1936-09-01 | 1 | 285.41 KB | 101J Vacuum Tube - Low-power, Filamentary Triode |
| AB46.031 | 1941-07-01 | 1 | 252.93 KB | 101D Vacuum Tube (Dome) - Low-Power, Filamentary Triode |
| AB46.035 | 1941-04-01 | 1 | 259.02 KB | 104D Vacuum Tube (Dome) - Filamentary, Power Amplifier Triode |
| AB46.052 | | 2 | 277.30 KB | 102F Vacuum Tube (Dome) - Filamentary, Voltage Amplifier Triode |
| AB46.090 | 1936-09-01 | 1 | 453.67 KB | 205D Vacuum Tube - Moderate Power, Filamentary Triode |
| AB46.091 | 1936-09-01 | 1 | 464.00 KB | 205E Vacuum Tube - Moderate Power, Filamentary Triode |
| AB46.101L | 1950-01-01 | 1 | 185.96 KB | 101L Triode - Audio-Frequency Amplifier |
| AB46.101M | 1950-01-01 | 1 | 201.31 KB | 101M Triode - Audio-Frequency Amplifer |
| AB46.102D | 1950-01-01 | 1 | 200.22 KB | 102D Triode - Audio-Frequency Amplifier |
| AB46.102L | 1950-01-01 | 1 | 198.49 KB | 102L Triode - Audio-Freuquency Amplifier |
| AB46.125 | 1936-09-01 | 1 | 300.17 KB | 215A Vacuum Tube - Small, Filamentary Triode |
| AB46.170 | 1936-09-01 | 1 | 276.77 KB | 231D Vacuum Tube - Small, Filamentary Triode |
| AB46.175 | 1941-08-01 | 1 | 204.76 KB | 233B Vacuum Tube - Half Wave, High Voltage, Water-cooled Rectifier |
| AB46.205F | 1950-01-01 | 1 | 208.30 KB | 205F Triode - Power Amplifier |
| AB46.212E | 1995-01-01 | 1 | 371.37 KB | 212E Vacuum Tube |
| AB46.235 | 1936-09-01 | 1 | 349.80 KB | 244A Vacuum Tube - Low-power Triode with Indirectly Heated Cathode |
| AB46.242C | 1948-11-01 | 1 | 284.04 KB | 242C Triode - Amplifier, Oscillator or Modulator |
| AB46.247A | 1948-04-01 | 1 | 269.95 KB | 247A Triode - Audio-Frequency Amplifier |
| AB46.249B | 1952-05-01 | 1 | 88.16 KB | 249B Electron Tube - Mercury-vapor Diode |
| AB46.249C | 1952-05-01 | 1 | 89.60 KB | 249C Electron Tube - Mercury-vapor Diode |
| AB46.253A | 1963-04-01 | 2 | 105.90 KB | 253A Rectifier - Half-wave, Mercury-vapor |
| AB46.258B | 1963-04-01 | 2 | 89.80 KB | 258B Electron Tube - Mercury-vapor Diode |
| AB46.259A | 1948-08-01 | 1 | 356.20 KB | 259A Tetrode - Indirectly Heated Cathode |
| AB46.262B | 1948-04-01 | 1 | 320.17 KB | 262B Triode - Audio-Frequency Amplifier |
| AB46.264C | 1950-09-01 | 1 | 177.80 KB | 264C Triode - Audio-Frequency Amplifier |
| AB46.266B | 1948-08-01 | 1 | 158.72 KB | 266B Rectifier - Half-wave, Mercury-vapor |
| AB46.266C | 1948-08-01 | 1 | 165.13 KB | 266C Rectifier - Half-wave, Mercury-vapor |
| AB46.268A | 1936-01-01 | 1 | 231.54 KB | 268A Vacuum Tube - Filamentary Air-cooled Triode |
| AB46.271A | 1948-08-01 | 1 | 267.51 KB | 271A Triode - Power Amplifier |
| AB46.272A | 1950-10-01 | 1 | 179.12 KB | 272A Triode - Low Power Amplifier |
| AB46.274A | 1948-08-01 | 1 | 158.70 KB | 274A Rectifier - Full-wave, High Vacuum |
| AB46.274B | 1948-08-01 | 1 | 180.16 KB | 274B Rectifier - Full-wave, High Vacuum |
| AB46.284D | 1949-02-01 | 1 | 248.33 KB | 284D Triode - Amplifier, Osciallator or Modulator |
| AB46.287A | 1962-10-01 | 3 | 143.87 KB | 287A Electron Tube - Three-electrode Mercury-vapor Thyratron |
| AB46.293A | 1950-09-01 | 1 | 234.41 KB | 293A Pentode - Power Amplifier |
| AB46.297A | 1962-10-01 | 1 | 172.00 KB | 297A Vacuum Tube - Three Element, Argon Filled, Filamentary Thyratron |
| AB46.300B | 1950-01-01 | 1 | 242.79 KB | 300B Triode - Power Amplifier |
| AB46.301A | 1963-04-01 | 1 | 195.87 KB | 301A Vacuum Tube - Full Wave, Thermionic, Mercury Vapor Rectifer |
| AB46.305 | 1936-09-01 | 1 | 286.94 KB | 257A Vacuum Tube - Small, Filamentary Triode |
| AB46.308B | 1936-01-01 | 1 | 249.44 KB | 308B Vacuum Tube - Filamentary Air-cooled Triode |
| AB46.310A | 1956-02-01 | 2 | 230.18 KB | 310A Electron Tube - Indirectly Heated Cathode Type |
| AB46.310B | 1956-02-01 | 2 | 219.30 KB | 310B Electron Tube - Indirectly Heated Cathode Type |
| AB46.311A | 1948-12-01 | 1 | 291.03 KB | 311A Pentode - Supressor Grid Power Pentode, Indirectly Heated Cathode |
| AB46.311B | 1960-10-01 | 1 | 194.54 KB | 311B Electron Tube - Supressor Grid Power Pentode, Indirectly Heated Cathode |
| AB46.313C | 1962-01-01 | 3 | 175.08 KB | 313C Electron Tube - Three-electrode, Inert-gas Filled, Cold Cathode Tube |
| AB46.313CA | 1962-01-01 | 3 | 168.34 KB | 313CA Electron Tube - Three-electrode, Inert-gas Filled, Cold Cathode Tube |
| AB46.313CB | 1962-01-01 | 3 | 165.42 KB | 313CB Electron Tube - Three-electrode, Inert-gas Filled, Cold Cathode Tube |
| AB46.313CC | 1962-01-01 | 3 | 169.15 KB | 313CC Electron Tube - Three-electrode, Inert-gas Filled, Cold Cathode Tube |
| AB46.315A | 1948-04-01 | 1 | 158.84 KB | 315A Rectifier - Half-wave, Mercury-vapor |
| AB46.323B | 1962-10-01 | 2 | 157.56 KB | 323B Electron Tube - Three-electrode, Mercury-vapor and Gas-filled Thyratron |
| AB46.328A | 1956-02-01 | 1 | 227.14 KB | 328A Electron Tube - Indirectly Heated Cathode Type Pentode Having a Separate Suppressor Grid Connection |
| AB46.333A | 1950-09-01 | 1 | 155.04 KB | 333A Cold Cathode - Three-electrode, Inter-gas Filled, Cold Cathode Tube |
| AB46.335 | 1936-09-01 | 1 | 372.61 KB | 262A Vacuum Tube - Low-power Triode with Indirectly-heated Cathode |
| AB46.336A | 1948-11-01 | 1 | 354.27 KB | 336A Pentode - Suppressor Grid, Power Pentode with Indirectly Heated Cathode |
| AB46.337A | 1951-04-01 | 1 | 197.89 KB | 337A Electron Tube - Variable-mu Pentode of the Unipotential Cathode Type |
| AB46.338A | 1962-10-01 | 1 | 171.21 KB | 338A Vacuum Tube - Three Element, Argon Filled, Thyratron, with Indirectly Heated Cathode |
| AB46.345A | 1948-08-01 | 1 | 163.19 KB | 345A Rectifier - Full-wave, High Vacuum |
| AB46.346B | 1956-04-01 | 3 | 187.26 KB | 346B Electron Tube - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.346C | 1962-01-01 | 1 | 172.42 KB | 346C Electron Tube - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.347A | 1948-08-01 | 1 | 281.22 KB | 347A Triode - Audio-Frequency Amplifier |
| AB46.348A | 1956-02-01 | 2 | 222.35 KB | 348A Electron Tube - Indirectly Heated Cathode Type Pentode Having a Separate Suppressor Grid |
| AB46.349A | 1948-11-01 | 1 | 330.98 KB | 349A Pentode - Suppressor Grid, Power Pentode with Indirectly Heated Cathode |
| AB46.350B | 1950-01-01 | 1 | 335.08 KB | 350B Tetrode - Beam Power Amplifier |
| AB46.351A | 1948-08-01 | 1 | 189.15 KB | 351A Rectifier - Full-wave, High Vacuum |
| AB46.353A | 1962-01-01 | 4 | 163.56 KB | 353A Electron Tube - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.354A | 1962-10-01 | 3 | 143.45 KB | 354A Electron Tube - Three-electrode, Mercury-vapor Thyratron |
| AB46.355A | 1962-10-01 | 2 | 144.79 KB | 355A Electron Tube - Three-electrode, Mercury-vapor and Gas-filled Thyratron |
| AB46.357B | 1950-01-01 | 1 | 284.77 KB | 357B Triode - Amplifier, Oscillator or Modulator |
| AB46.358A | 1962-02-01 | 1 | 121.18 KB | 358A Electron Tube - Two-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.359A | 1962-06-01 | 3 | 173.08 KB | 359A Electron Tube - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.372A | 1950-09-01 | 1 | 134.49 KB | 372A Cold Cathode - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.373A | 1950-05-01 | 1 | 167.54 KB | 373A Pentode - Filamentary Type Suppressor Grid Pentode |
| AB46.374A | 1950-05-01 | 1 | 289.00 KB | 374A Pentode - Filamentary Type Suppressor Grid Pentode |
| AB46.375A | 1950-05-01 | 1 | 245.38 KB | 375A Pentode - Beam Power Pentode of the Heater Cathode Type |
| AB46.376B | 1956-04-01 | 4 | 169.63 KB | 376B Electron Tube - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.376C | 1962-01-01 | 1 | 159.71 KB | 376C Electron Tube - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.393A | 1962-10-01 | 2 | 159.30 KB | 393A Electron Tube - Three-electrode, Mercury-vapor and Gas-filled Thyratron |
| AB46.394A | 1962-10-01 | 2 | 146.26 KB | 394A Electron Tube - Three-electrode, Mercury-vapor and Gas-filled Thyratron |
| AB46.395A | 1962-02-01 | 2 | 164.04 KB | 395A Electron Tube - Ruggedized Three-electrode Inert-gas-filled Cold Cathode Tube |
| AB46.396A | 1954-11-01 | 2 | 193.81 KB | 396A Electron Tube - 2C51 9-pin Miniature Double Triode Having Separate Indirectly Heated Cathodes |
| AB46.398A | 1948-05-01 | 1 | 39.70 KB | 398A Electron Tube - 5603 Filamentary Power Pentode Amplifier |
| AB46.400A | 1948-05-01 | 1 | 44.33 KB | 400A Electron Tube - Miniature Pentagrid Converter |
| AB46.401A | 1948-08-01 | 2 | 168.11 KB | 401A Pentode - 5590 7-pin Miniature Pentode Having an Indirectly Heated Cathode |
| AB46.403A | 1950-09-01 | 2 | 166.35 KB | 403A Pentode - 6AK5 7-pin Miniature Pentode Having an Indirectly Heated Cathode |
| AB46.403B | 1962-09-01 | 3 | 189.74 KB | 403B Electron Tube - 7-pin Miniature Pentode Having an Indirectly Heated Cathode |
| AB46.404A | 1955-11-01 | 2 | 194.49 KB | 404A Electron Tube - Indirectly Heated Cathode Type Miniature Pentode |
| AB46.405A | 1950-01-01 | 2 | 121.33 KB | 405A Cold Cathode - Three-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.407A | 1962-09-01 | 3 | 177.16 KB | 407A Electron Tube - 9-pin Miniature Double Triode With Separate Indirectly Heated Cathodes |
| AB46.408A | 1953-12-01 | 3 | 225.84 KB | 408A Electron Tube - 6028 7-pin Miniature Pentode Having an Indirectly Heated Cathode |
| AB46.409A | 1948-05-01 | 1 | 164.61 KB | 409A Electron Tube - 6AS6 7-pin Miniature, Triple-grid Pentode With an Indirectly Heated Cathode |
| AB46.410A | 1962-10-01 | 3 | 164.65 KB | 410A Electron Tube - Three-electrode Mercury-vapor Thyratron |
| AB46.411A | 1949-01-01 | 1 | 72.09 KB | 411A Electron Tube - Four-electrode, Inert-gas-filled, Cold Cathode Tube |
| AB46.412A | 1949-01-01 | 1 | 39.86 KB | 412A Electron Tube - Miniature Full-Wave Rectifier |
| AB46.413A | 1956-04-01 | 2 | 156.44 KB | 413A Electron Tube - Two-electrode Inert-gas-filled Cold Cathode Tube, High Current |
| AB46.413B | 1962-01-01 | 1 | 140.79 KB | 413B Electron Tube - Two-electrode Inert-gas-filled Cold Cathode Tube, High Current |
| AB46.414A | 1949-05-01 | 1 | 122.31 KB | 414A Electron Tube - Miniature Pentode With an Indirectly Heated Cathode |
| AB46.415A | 1949-04-01 | 1 | 167.47 KB | 415A Electron Tube - Miniature Suppressor-Grid Pentode |
| AB46.416A | 1949-06-01 | 1 | 91.46 KB | 416A Electron Tube - Disc-seal Planar Type Triode |
| AB46.416B | 1953-05-01 | 1 | 94.63 KB | 416B Electron Tube - 6280 Planar Type Triode |
| AB46.417A | 1962-09-01 | 3 | 148.91 KB | 417A Electron Tube - 9-pin Miniature Triode with an Indiretly Heated Cathode |
| AB46.418A | 1956-04-01 | 1 | 165.54 KB | 418A Electron Tube - Indirectly Heated Cathode Type Tetrode |
| AB46.420A | 1962-06-01 | 2 | 204.21 KB | 420A Electron Tube - Double-triode Having Separate Indirectly Heated Cathodes |
| AB46.421A | 1953-10-01 | 2 | 134.12 KB | 421A Electron Tube - 5998 Double Triode Having Separate Indirectly Heated Cathodes |
| AB46.422A | 1952-10-01 | 2 | 164.08 KB | 422A Electron Tube - Double Diode with Indirectly Heated Cathodes |
| AB46.423A | 1952-12-01 | 3 | 100.95 KB | 423A Electron Tube - 6140 Two-electrode Inert-gas Filled Cold Cathode Tube |
| AB46.423C | 1962-12-01 | 1 | 160.67 KB | 423C Electron Tube - Two-electrode Inert-gas Filled Cold Cathode Tube |
| AB46.425A | 1962-06-01 | 4 | 202.31 KB | 425A Electron Tube - Four-electrode, Inert-gas Filled Cold Cathode Tube |
| AB46.426A | 1962-01-01 | 4 | 175.30 KB | 426A Electron Tube - Three-electrode Inert-gas-filled Miniature Cold Cathode Tube |
| AB46.427A | 1962-10-01 | 3 | 188.39 KB | 427A Electron Tube - Three-electrode Inert-gas-filled Miniature Cold Cathode Tube |
| AB46.429A | 1961-02-01 | 3 | 188.35 KB | 429A Electron Tube - Beam Pentode of the Indirectly Heated Cathode Type |
| AB46.430A | 1956-04-01 | 2 | 200.39 KB | 430A Electron Tube - Three-electrode Inert-gas-filled, Cold Cathode Tube |
| AB46.430B | 1962-01-01 | 1 | 197.18 KB | 430B Electron Tube - Three-electrode Inert-gas-filled, Cold Cathode Tube |
| AB46.432A | 1950-10-01 | 1 | 82.20 KB | 432A Electron Tube - Three-electrode Inert-gas Filled Cold Cathode Tube |
| AB46.432B | 1956-12-01 | 2 | 149.18 KB | 432B Electron Tube - Three-electrode Inert-gas Filled Cold Cathode Tube |
| AB46.435A | 1954-06-01 | 2 | 187.66 KB | 435A Electron Tube - High Figure of Merit Miniature Tetrode with an Indirectly Heated Cathode |
| AB46.436A | 1963-05-01 | 2 | 197.03 KB | 436A Electron Tube - High Figure of Merit Miniature Tetrode with an Indirectly Heated Cathode |
| AB46.437A | 1955-10-01 | 1 | 169.98 KB | 437A Electron Tube - High Figure of Merit Triode with an Indirectly Heated Cathode |
| AB46.440A | 1962-01-01 | 1 | 200.04 KB | 440A Electron Tube - Filamentary Triode, Low-Power Amplifier |
| AB46.441A | 1962-01-01 | 1 | 204.80 KB | 441A Electron Tube - Filamentary Triode, Voltage Amplifier |
| AB46.442A | 1962-03-01 | 1 | 206.96 KB | 442A Electron Tube - Filamentary Triode, Power Amplifier |
| AB46.443A | 1962-01-01 | 2 | 187.20 KB | 443A Electron Tube - Three-electrode Inert-gas Filled Miniature Cold Cathode Tube |
| AB46.444A | 1960-08-01 | 1 | 260.70 KB | 444A Electron Tube - Medium Power Helix-type Traveling Wave Amplifier |
| AB46.446A | 1963-06-01 | 1 | 147.64 KB | 446A Electron Tube - Three-electrode Inert-gas Filled Cold Cathode Tube |
| AB46.447A | 1963-06-01 | 1 | 124.24 KB | 447A Electron Tube - Two-electrode Inert-gas Filled Cold Cathode Tube |
| AB46.448A | 1961-09-01 | 1 | 163.35 KB | 448A, 448B, 454A Electron Tube - High Figure of Merit Tetrodes of the Indirectly Heated Cathode Type |
| AB46.451A | 1962-08-01 | 1 | 189.52 KB | 451A Electron Tube - Four-electrode, Inert-gas Filled Cold Cathode Tube |
| AB46.453A | 1963-06-01 | 1 | 159.77 KB | 453A Electron Tube - Two-electrode, Inert-gas Filled Cold Cathode Tube |
| AB46.540 | 1937-01-01 | 1 | 198.09 KB | 301A Vacuum Tube - Full Wave, Thermionic, Mercury Vapor Rectifer |
| AB46.585 | 1939-08-01 | 1 | 349.08 KB | 311A and 329A Vacuum Tubes - Low-power, Suppressor-grid Pentodes with Indirectly Heated Cathodes |
| AB46.595 | 1936-09-01 | 1 | 204.81 KB | 313A Vacuum Tube - Double Gap, Cold Cathode, Gas-Filled Tube |
| AB46.607 | 1939-10-01 | 1 | 364.61 KB | 352A Vacuum Tube - Duodiode Triode with Indirectly Heated Cathode |
| AB46.6167 | 1952-06-01 | 1 | 156.37 KB | 6167 Electron Tube - Ten-stage Cold-cathode Gas-discharge Stepping Tube |
| AB46.634 | 1938-02-01 | 1 | 103.29 KB | 327A Vacuum Tube - Halve-wave, Tungsten Filament, Argon Filled Rectifier |
| AB46.636 | 1937-04-01 | 1 | 372.72 KB | 328A Vacuum Tube - Voltage-amplifier, Suppressor-grid Pentode with Indirectly Heated Cathode |
| AB46.640 | 1941-08-01 | 1 | 383.91 KB | 384A and 385A Vacuum Tubes - Voltage Amplifier, Suppressor-grid Pentodes with Indirectly Heated Cathodes |
| AB47.006 | 1954-05-01 | 1 | 3.65 MB | Bell System Transmission Transformers |
| AB47.006 | 1958-03-01 | 2 | 3.23 MB | Bell System Transmission Transformers |
| AB47.007 | 1956-03-01 | 1 | 3.14 MB | Bell System Capacitors |
| AB47.008 | 1958-03-01 | 1 | 2.20 MB | Bell System Transmission Networks |
| AB84.128 | 1934-06-01 | 1 | 23.47 MB | Description of 14-Type Tape Printers and Associated Apparatus |
| AB84.138 | 1941-11-01 | 1 | 3.54 MB | Description of Operation of No. 14 and No. 20 Transmitter Distributors |
| AB84.139 | 1941-11-01 | 1 | 14.35 MB | Description of Operation of No. 15 Teletypewriter |
| AB84.140 | 1941-11-01 | 1 | 4.82 MB | Description of Operation of No. 15-Type Perforator Transmitter |
| AB84.141 | 1941-11-01 | 1 | 12.24 MB | Description of Operation of No. 26 Teletyprewriter |
| AB84.143 | 1942-04-01 | 1 | 8.78 MB | Description of Operation of Typing Reperforator |
| AB85.025LL A | 1961-01-01 | B | 2.49 MB | Engineering and Operating Considerations Involved in Furnishing Circuits to Western Union Telegraph Company Under Special Contract |
| AB95.101 | 1938-08-01 | 1 | 3.76 MB | Educational Training Material - Telegraph - Lecture 1 - General |