Up for sale is a sensational 1959 Fender Vibrolux (5F11 circuit) in fantastic vintage condition.

If you are looking for that legendary, swampy bias-modulated tremolo and sweet, touch-sensitive breakup in a vintage tweed package, the 5F11 is widely considered the sweet spot between a Harvard and a Deluxe. This particular amp hits the absolute "Goldilocks" tier for players and collectors alike: deeply original where tone matters, but expertly serviced to be safe, reliable, and stage/studio ready.

Tech & Service History

All service work on this amplifier was performed by master builder Keith Entringer at Redplate Amps, ensuring the highest level of craftsmanship, safety, and respect for the amp's vintage originality.

Condition & Circuit Breakdown

• Original Iron & Signal Path: Features original transformers and the highly desirable yellow Astron signal capacitors (.1 MFD, .02 MFD, .01 MFD) throughout the eyelet board, preserving the true 1959 voice of this circuit.
• Restuffed Aerovox Capacitors: The main filter capacitors have been meticulously serviced—the original yellow Aerovox Dandee sleeves were preserved and restuffed with fresh, high-quality modern electrolytics. You get 100% period-correct vintage aesthetics inside the chassis without risking original components to dried-up 65-year-old caps.
• Safety Upgrade: Updated to a grounded 3-prong power cord for safe operation on modern AC power. The original "death cap" was clipped on one leg and left physically in place on the board to maintain the vintage component layout.
• Speaker: Features a period-correct Jensen Special Design P10 Series blue-bell Alnico speaker with incredible response and clarity.
• Tube Chart & Cabinet: Original tube chart stamped "IR" inside the pine cabinet. The original tweed covering shows honest, authentic play wear, fraying, and a natural aged patina that tells the story of a well-loved vintage instrument.
• Footswitch Included: Comes complete with a vintage single-button footswitch for the tremolo circuit.

Summary Specs

• Model: 5F11 Vibrolux
• Year: 1959
• Power Output: ~10 Watts
• Speaker: Jensen P10 Alnico Blue-Bell
• Tubes: 5Y3GT Rectifier, (2) 6V6GT Power Tubes, (2) 12AX7 Preamp Tubes

Ships fully insured, packed with extreme care, and tubes pulled/labeled separately for safe transit. Feel free to reach out with any questions or request specific photos!

As I am not a store I do not accept returns but guarantee it will arrive as show and ready to plug in and play. So please ask any questions before hitting "buy" so everything is clear, I'm happy to answer anything!