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Alfred

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

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SKU:
18508
MPN:
653K-S2
Condition:
Used
Availability:
Usually ships within 1–2 business days.
Weight:
22.00 LBS
Shipping:
Calculated at Checkout
  • 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 top panel analog frequency scale spanning 3.7 to 8.3 GHz with multiple graduated tracks
  • Alfred 653K-S2 label close-up: Backward-Wave Oscillator Type TD3, SE-221-17, Serial 91552, Date 7504, Heater 6.3V, Anode 166V, Cathode 8.5 mA
$120.00
Was: $250.00
Current Stock: 1

Sold Out

Description

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.

Specifications & What's Included

  • Model: 653K-S2 (MPN: SE-221-17)
  • Frequency Range: 3.7–8.3 GHz
  • Tube Type: TD3
  • Heater Voltage: 6.3 V
  • Anode Voltage: ~166 V
  • Cathode Current: 8.5 mA
  • Connectors: BNC (RF Output, RF Sampler), multi-pin edge connectors (rear)
  • Includes analog frequency scale top panel
  • Manufactured: 1975 (Date code 7504)

Applications

BWO modules were widely used in radar systems, electronic test equipment, and communications platforms requiring tunable microwave signal generation. This frequency range covers X-band and portions of Ku-band. Typical integration in military and aerospace test benches, microwave measurement instrumentation, and early solid-state replacement evaluation systems.

Condition: For Parts or Not Working
This Alfred 653K-S2 Backward Wave Oscillator Plug-In is being sold AS-IS for parts or repair. Due to its age — date code 7504, placing manufacture in 1975 — we cannot verify functionality, and this item is offered without any operational guarantee. The unit appears cosmetically intact with no obvious physical damage visible on the front panel, top frequency scale, or rear connectors. It has not been powered or tested at our facility. Please view our photo set and contact us if you have any questions.
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Warranty Information

We stand behind every item we sell with a 30-day money-back guarantee. If your item arrives not as described, you may return it within 30 days for a full refund. Please inspect your purchase upon arrival and contact us with any questions.
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Additional Information

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.
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18505
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Usually ships within 1–2 business days.
Weight:
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Brand:
Alfred Electronics
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MPN:
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Form Factor:
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Power Requirements:
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RF Output:
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Sweep Modes:
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Modulation:
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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:
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18509
SKU:
18509
Availability:
Usually ships within 1–2 business days.
Weight:
22.00 LBS
Brand:
Alfred / 3DBM INC
Model:
654K-S1
MPN:
654K-S1
Type:
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SKU:
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Frequency Range:
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Frequency Band:
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RF Output Type:
Leveled and Unleveled RF Output
Features:
RF Sampler section (INT/EXT input)
Form Factor:
Plug-In Module
Connector Type:
BNC (RF output); multi-pin rear connectors
Condition:
Used – Inspected, Good Condition
Seller Notes:
Plug-in module only; no mainframe or cables included
Country/Region of Manufacture:
United States
Condition Notes:
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