Hallicrafters SX-25 Super Defiant Receiver | Part 7: Hallicrafters PM-23 Speaker Update and mods!
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- Опубликовано: 12 сен 2024
- The Hallicrafters PM-23 features a Hallicrafters-Jensen 10 inch speaker. It is designed for use with the larger Hallicrafters receivers such as the SX-28, SX-28A and SX-42. This permanent magnet type speaker with coupling transformer matches the 5000 ohm output of the receiver. The speaker opening is concealed by an attractive metal grill. This speaker was introduced in 1939. The chrome "h" on the front was deleted during speakers produced during World War II.
16 x 11 x 11 inches.
Hallicrafters SX-25 Super Defiant Receiver, Made In: United States 1940-1946
Circuit Complement: 6SK7 1st RF Amp, 6SK7 2nd RF Amp, 6K8 1st Detector-Mixer, 6SK7 1st IF ANL, 6SK7 2nd IF Amp, 6SQ7 2nd Detector/AVC/1st Audio Amp, 6SQ7 Phase Inverter, (2) 6F6 Audio Amp, 6H6 ANL, 6J5GT BFO and 80 Rectifier.
Features: • ¼" Head. Jack • S-Meter • Tone (2 Pos.) • Bandspread • RF Gain • Mute Line • Standby • Speaker Terminals • ANL • AVC • Dial Lamp • Hinged Top Cover • BFO • Flywheel Tuning
Ranges: .54-1.7, 1.7-5.1, 5-15.7 and 15.2-42 MHz. The true bandspread covers: 80, 40, 20 and 10 meters.
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The "Super Defiant"
The SX-25 is was introduced in 1940. It is an upgrade to the lower cost SX-24 "Defiant" introduced the prior year. With 12 tubes compared to 9 in the SX-24, the SX-25 featured push-pull audio in place of the single-ended audio of the SX-24 and an additional tuned RF stage for all bands except AM broadcast.
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At roughly 52 pounds this is a true Boatanchor.
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Ketk.