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  • Alfred 653K-S2 Oscillator Plug-In front panel showing RF Output, RF Sampler BNC connectors, Lock knob, and 3.7–8.3 GHz frequency label Alfred 653K-S2 BWO Plug-In rear view showing two multi-pin connector interfaces on red-bordered panel

    Alfred 653K-S2 Backward Wave Oscillator Plug-In 3.7-8.3 GHz BWO TD3 SE-221-17

    Alfred

    $120.00
    Was: $250.00
    Alfred 653K-S2 Backward Wave Oscillator Plug-In 3.7-8.3 GHz BWO TD3 SE-221-17 Backward Wave Oscillator (BWO) plug-in module operating across the 3.7–8.3 GHz frequency range. The TD3 tube generates RF output with electronic frequency tuning capability...
    18508
    SKU:
    18508
    Availability:
    Usually ships within 1–2 business days.
    Weight:
    22.00 LBS
    Brand:
    Alfred Electronics
    Model:
    653K-S2
    MPN:
    SE-221-17
    Type:
    Backward Wave Oscillator (BWO) Plug-In
    SKU:
    18508
    Tube / Device Type:
    TD3
    Frequency Range:
    3.7 – 8.3 GHz
    Heater Voltage:
    6.3 V
    Approx. Anode Voltage:
    166 V
    Cathode Current:
    8.5 mA
    Date Code:
    7504 (manufactured Q4 1975 or Q1 1975)
    Output Type:
    RF Output (Leveled / Unleveled)
    Connector Types:
    BNC (RF Output, RF Sampler); multi-pin edge connectors (rear)
    Form Factor:
    Plug-In Module
    Condition:
    As-Is / For Parts or Not Working
    Seller Notes:
    Sold AS-IS. Includes analog frequency scale top panel. No functionality guarantee.
    Country/Region of Manufacture:
    United States
    Condition Notes:
    Alfred 653K-S2 Backward Wave Oscillator Plug-In sold AS-IS for parts or repair. Date code 7504 (1975). Not tested or powered at our facility. No functionality guarantee. Please view photos and contact us with questions.
    $120.00
    Was: $250.00
  • Alfred Electronics 650 Sweep Oscillator with 652CK 2–4 GHz plug-in — three-quarter front-left view showing full benchtop cabinet and dual-unit stack Alfred Electronics 650 Sweep Oscillator Model 650 — straight-on front panel view showing frequency dial scales, rotary controls, sweep and modulation sections

    Alfred Electronics 650 Sweep Oscillator 2-4 GHz w/ 652CK Plug-In Benchtop RF

    Alfred Electronics

    $300.00
    Was: $600.00
    Alfred Electronics 650 Sweep Oscillator 2-4 GHz w/ 652CK Plug-In Benchtop RF The Alfred Electronics 650 is a vintage benchtop sweep oscillator mainframe designed to accept interchangeable oscillator plug-ins covering different microwave frequency bands...
    18505
    SKU:
    18505
    Availability:
    Usually ships within 1–2 business days.
    Weight:
    76.00 LBS
    Brand:
    Alfred Electronics
    Model:
    650
    MPN:
    650
    Secondary Model:
    652CK
    Type:
    Sweep Oscillator / RF Signal Generator
    SKU:
    18505
    Frequency Range:
    2–4 GHz (652CK plug-in)
    Plug-In Model:
    Alfred 652CK Oscillator Plug-In, 2–4 GHz
    Form Factor:
    Benchtop
    Power Requirements:
    115V 3A / 230V 1.5A
    RF Output:
    Leveled and Unleveled RF Output
    Sweep Modes:
    Manual Sweep, Single, Retrace, Free Run, External
    Modulation:
    AM Off, SQ Wave, FM
    Markers:
    M1, M2 frequency markers
    Rear Panel Features:
    Remote Freq, Remote Power Level, Blanking Relay Contact Output
    Frequency Stabilizing Input:
    Yes — rear panel
    External RF Sampler:
    Yes — Sens and Input connectors
    Condition:
    Used – Not Fully Tested
    Seller Notes:
    Includes 652CK 2–4 GHz oscillator plug-in. Can be previewed in Ventura, CA.
    Country/Region of Manufacture:
    United States
    Condition Notes:
    Alfred Electronics 650 Sweep Oscillator w/ 652CK 2–4 GHz plug-in. From a retired engineer's collection; not fully tested at our facility. Cosmetic wear consistent with age. Preview available in Ventura, CA. Photos available.
    $300.00
    Was: $600.00
  • PC Power & Cooling ST 450 LanSpeed server power supply – angled left side view showing dual top fans and multi-wire harness PC Power & Cooling ST 450 LanSpeed server power supply – right side view with LanSpeed Systems label and output wiring harness

    PC Power & Cooling ST 450 LanSpeed Server Power Supply 115V 230V 450W

    PC Power & Cooling

    $100.00
    Was: $250.00
    PC Power & Cooling ST 450 LanSpeed Server Power Supply 115V 230V 450W The PC Power & Cooling ST 450 is a high-output ATX-style server power supply manufactured for LanSpeed Systems servers. It features a dual-fan cooling configuration, a multi-connector...
    18449
    SKU:
    18449
    Availability:
    Usually ships within 1–2 business days.
    Weight:
    14.00 LBS
    Brand:
    PC Power & Cooling
    Model:
    ST 450
    MPN:
    ST 450
    SKU:
    18449
    Condition:
    Used – Inspected
    Seller Notes:
    Power supply only; no additional accessories included.
    Form Factor:
    Desktop / Tower
    Compatible With:
    LanSpeed Systems servers
    Country of Manufacture:
    United States
    Input Voltage:
    115VAC @ 9A or 230VAC @ 5A, 50/60 Hz
    Output Voltage:
    +5V @ 45A, -5V @ 0.5A, +12V @ 15A, -12V @ 1A
    Peak Output:
    20A Peak
    Power Rating:
    450W
    Frequency:
    50/60 Hz
    Efficiency Level:
    Level 6
    Connector Type:
    Molex 4-pin, Berg mini connectors, multi-wire harness
    Certifications:
    UL, CSA
    Condition Notes:
    This PC Power & Cooling ST 450 LanSpeed server power supply has been inspected and appears to be in good used condition. The chassis is intact with no significant dents or deformation.
    $100.00
    Was: $250.00