Product Overview
Plessey SW300 Vestigial Sideband Filter for Video RF Modulators
Condition
New old stock component. Unused vintage inventory. Marked PLW D6 SW300 HONG KONG on top face. Five straight wire leads seated in glass seals with case alignment tab. Visual inspection confirms straight leads and clean can exterior.
Ships same or next business day from our Idaho warehouse. Honest pricing, no nonsense.
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Product Overview
Plessey manufactured the SW300 as a specialized Surface Acoustic Wave (SAW) vestigial sideband filter, distributed by Poly Paks under Kit King Kits catalog number 3975. Engineered for television RF modulators, it provides bandpass shaping for US TV Channel 3 (61.25 MHz) and Channel 4 (67.25 MHz). The 5-pin TO-8 style metal package integrates separate 75-ohm inputs for each channel and a shared 75-ohm output, making it a critical filter stage in vintage home gaming consoles, modulators, and amateur television (ATV) transmitters.
Key Features
- Dual-channel vestigial sideband filtering for US TV Channel 3 (61.25 MHz) and Channel 4 (67.25 MHz)
- Surface Acoustic Wave (SAW) architecture for precise bandpass response
- Dedicated 75-ohm RF input per channel with combined 75-ohm output
- 5-pin hermetic TO-8 style round metal enclosure with indexing rim tab
- Straight wire pin terminals sealed through glass feedthroughs
- Stamped identification: PLW D6 SW300 HONG KONG
Applications
- Replacing degraded or missing SAW filters in vintage home video game RF modulators and early computer video interface units
- Constructing or repairing amateur television (ATV) transmitters and Gunnplexer microwave video downlink gear
- Benchtop RF experimentation and custom VHF vestigial sideband modulator design for retro computing displays
Frequently Asked Questions
What are the pin connections on this SW300 filter?
The unit features five wire leads configured with separate 75-ohm input terminals for TV channels 3 and 4, a common 75-ohm output, and case ground references, oriented via the rim indexing tab.
Is this a standard quartz crystal resonator?
No. While vintage catalogs occasionally grouped these with crystals due to the metal enclosure, this is a dedicated Surface Acoustic Wave (SAW) filter designed for TV vestigial sideband frequency filtering at 61.25 MHz and 67.25 MHz.
Why buy this individual SW300 filter instead of an unverified surplus lot?
Sourcing a single, identified vintage SAW filter avoids buying unsorted mixed lots of mystery RF cans with unknown pins or damaged leads. You receive the exact piece shown, inspected for physical integrity and clear markings. Orders ship for an $8 flat rate, or free once your order reaches $28, leaving our Idaho warehouse the same or next business day.
Vintage RF video modulators carried the glow of early home gaming and ham television across living room screens. Sliding this pristine SAW filter onto the bench puts an authentic slice of broadcast-band history right back into tune.
