Fender Pro Reverb AB668 Filter Capacitor Replacement Set

NOT FOR REISSUE MODELS

Valve Amplifier Power Supply Recapping Kit by EVATCO

Restore that original high-headroom clarity, punchy low-end response, and long-term reliability to your vintage tube amplifier with this specialized Fender Pro Reverb AB668 Filter Replacement Set from EVATCO. Engineered specifically for Silverface Fender Pro Reverb chassis, this recapping kit replaces aged, leaky factory electrolytic capacitors with premium high-voltage components designed to eliminate power supply hum and safeguard your transformers.

Whether you are performing routine maintenance or a full circuit restoration, sourcing high-grade, correctly rated filter capacitors is essential for maintaining dynamic responsiveness, clean headroom, and bulletproof performance in vintage AB668 circuits.

Circuit & Model Compatibility

This all-in-one capacitor replacement set is tailored specifically to fit late-1960s Silverface Fender chassis featuring the following circuit revision:

• Fender Pro Reverb: AB668 Circuit

Parts Included in This Set & Their Circuit Roles

Default components included in this kit are listed below along with their specific function within the AB668 power supply, bias, and preamp sections. We source trusted brands such as F&T and Sprague to ensure exact physical fit inside the original chassis doghouse enclosure. Alternative brands (including EVATCO's home brand when available) can be selected to suit your build budget:

• 2 x F&T 80uF - 450V Electrolytic Capacitors: Main reservoir power supply filter capacitors (wired in series).
• 3 x F&T 22uF - 500V Electrolytic Capacitors: Power supply decoupling filter capacitors for screen grids, phase inverter, and preamp stages.
• 1 x F&T 100uF - 100V Bias Filter Capacitor: Bias supply filtering to ensure stable, noise-free grid bias voltage for output tubes.
• 7 x Sprague 25uF - 25V Cathode Bypass Capacitors: Preamp and phase inverter cathode bypass capacitors to stabilize gain stages.
• 1 x 4.7uF - 100V Non-Polarized (NP) Capacitor: Vibrator/Tremolo circuit bypass capacitor.
• 1 x 10K - 2W Resistor: Power supply B+ dropping resistor.
• 1 x 4.7K - 2W Resistor: Power supply B+ dropping resistor.
• 2 x 220K - 1W Voltage Balancing Resistors: Equalizing resistors across the main series filter capacitors.

Benefits of Recapping Your Vintage Fender Amp

• Eliminate Mains Hum & Noise: Original 50+ year-old filter capacitors lose capacitance tolerance and leak DC voltage, introducing frustrating 50Hz/100Hz background hum into your signal path.

• Restore Tight Low-End & Clean Headroom: Fresh filter sets stabilize high-voltage power rails, preserving tight bottom-end punch, fast transient response, and pristine clean headroom.

• Protect Output & Power Transformers: Shorted or dried-out power supply capacitors put heavy stress on rectifiers and transformers—leading to catastrophic component failures.

Premium Components for Classic Tube Amps

Every EVATCO filter replacement set features trusted high-voltage electrolytic capacitors chosen for exact value tolerances and physical fit inside vintage Fender doghouse housings. Order your Fender Pro Reverb AB668 filter capacitor replacement kit online today. EVATCO offers fast delivery across Australia and worldwide shipping for all your valve amplifier parts and tube amp restoration needs.

Disclaimer: FENDER® and specific amplifier model designations including Bandmaster, Bandmaster Reverb, Silverface, Pro Reverb, and AB668 are registered trademarks of Fender Musical Instruments Corporation. EVATCO is an independent retailer of aftermarket upgrade components and restoration parts. EVATCO is not affiliated with, sponsored by, or officially connected to Fender Musical Instruments Corporation. All trademark references are used strictly to describe product compatibility.