Overview
The Plastic Capacitors Inc LK 50-625 is a vintage polyester capacitor unit specifically engineered for low-frequency audio applications requiring dual capacitance and voltage ratings. This assembly combines a 6 microfarad capacitor rated at 3300VDC with a 0.25 microfarad capacitor rated at 5000VDC, packaged in a rectangular metal case with threaded stud terminals. These units are widely recognized for filter, bypass, and coupling applications in vintage industrial and audio equipment.
Key Features
- Dual capacitance ratings: 6µF (T1-T2) and 0.25µF (T3-T4) for flexible circuit configurations
- High voltage ratings: 3300VDC and 5000VDC respectively, suitable for demanding power supply circuits
- Polyester film dielectric for reliable long-term performance
- Threaded stud terminals with nut and solder lug for robust panel mounting
- Designed for audio-frequency and low-frequency filter applications
- All-position operation capability via internal design
Technical Specifications
- Capacitance (T1-T2): 6 µF
- Voltage Rating (T1-T2): 3300 VDC
- Capacitance (T3-T4): 0.25 µF
- Voltage Rating (T3-T4): 5000 VDC
- Dielectric Material: Polyester film
- Case Style: Rectangular metal, CP70 container
- Terminal Type: Threaded stud with nut and solder lug
- Operating Position: Any position (internal construction permits)
- Primary Application: Audio frequency filter, bypass, coupling
- Manufacturer: Plastic Capacitors, Inc.
Typical Applications
- High-voltage filter circuits in vintage tube amplifiers and power supplies
- Coupling and bypass applications in audio frequency circuits
- DC filter stages in high-voltage power conditioning equipment
- Restoration and repair of legacy industrial and broadcast equipment
- Energy storage and snubber circuits requiring dual capacitance values
Compatibility & Replacements
Compatible With
- Vintage tube audio amplifiers and preamps
- Industrial power supply circuits rated for 3300–5000 VDC operation
- Broadcast and communications equipment from mid-20th century
- Legacy test and measurement apparatus
- Any circuit requiring dual-capacitance filter or coupling blocks
Replaces / Drop-In Replacement For
- Original equipment manufacturer (OEM) Plastic Capacitors Inc LK 50-625 units
- Equivalent vintage polyester capacitor blocks with matching terminal configurations
- Verify pin configuration and terminal spacing with original equipment documentation before installation
Works With
- Any high-voltage DC power supply or filter circuit designed for 3300–5000 VDC operation
- Equipment using threaded stud or solder-lug terminal connections
- Vintage tube-based audio and industrial electronics requiring polyester film capacitors
- Custom high-voltage power supply assemblies and panel-mount applications
