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Eddystone 670A

670A
General Coverage Broadcast Receiver
Made In: England 1953-1960 Voltages: 110/200/230 VAC or 110/200/230 VDC
Coverage: 150-380, 540-30000 kHz. Readout: Analog
Modes: AM Selectivity: ?
Circuit: Single Conversion Superheterodyne. 6 Tubes plus Semis. Physical: ?
Circuit Complement: UAF42 RF Amplifier, UCH42 Frequency Changer, UAF42 IF Amp/AGC, UAF42 Detector/Audio, UL41 Audio Output, DM70 Tuning Indicator plus a diode rectifier.
Features: Speaker Output Dial Lamp Rack Handles Tuning Indicator Speaker Phono Input Vernier Tuning Log Scale 0-2500 Tone Flywheel Tuning
Accessories: 732 Mains Filter
New Price: ? Used Price: 80-100
Comments: The 670 series was expressly designed for ship board cabin use. The 670A has five ranges: .15-.38, .54-1.5 3.7-10.6 and 10.5-30 MHz. The fifth "range" is marked "G" which is for a gramophone (phonograph) input. The broadcast bands are marked on the dial. The vernier tuning scale is a mechanical bandspread scheme that provides a quick and accurate means to return to a previously logged frequency. The tuning indicator (DM70) is a green fluorescent tube. With no signal the glow will extend to its full length. When a signal is received the glow contracts.
Variants: The earlier model 670 was introduced in 1948 (37-40 new) and had 7 tubes. The original 670 had the medium wave scale marked in meters.

Eddystone 680X

680X
General Coverage Communications Receiver
Made In: England 1952-1962 Voltages: 110/125 200/250 VAC 40-60 Hz 80W
Coverage: 480 - 30000 kHz. Readout: Analog
Modes: AM/CW Selectivity: 6/3/1.3 kHz -6dB.
Circuit: Single Conversion Superheterodyne. 15 Tubes. Physical: 16.75x8.75x15" 47 Lbs. 426x222x381 mm 21.3 kg
Circuit Complement: 6BA6 RF Amp, 6BA6 RF Amp, 6BE6 Mixer, 8D3 Local Osc, 6BA6 IF, 6BA6 IF, 6AL5 Detector/AVC, 6BR7 AF, 6BR7 AF, 7D9 Audio Amp, 7D9 Audio Amp, 6BA6 BFO, 6AL5 S-Meter/NL, 5Z4QT Rectifier and VR150 Voltage Stabilizer. Two RF stages and two IF stages. Crystal filter.
Features: " Head. Jack S-Meter Rack Handles Calibrator 100 kHz RF Gain BFO 3 kHz Mute 140:1 Tune Ratio Standby NL Dial Lamp Dimmer (back panel) AVC ON/OFF Flywheel Tuning
Accessories: 812 Mounting Feet, 811 Diecast Speaker, 688 Speaker Black
New Price: 106-140 Used Price: 90-160
Comments: The 680X replaced the similar 680/2. The 680X has a 6BE6 for V3 rather than the 7S7 found in the 680. It also adds a crystal filter and product detector. Ranges: .48-1.12, 1.11-2.5, 2.5-5.7, 5.3- 12.5 and 12.3-30 MHz. Note headphone jack on the side.
Variants: Model 680X/RM is for rack mounting.

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