Externally, the rather fragile tweed covering shows only fairly minor signs of wear, mostly along the corners. This Vibrolux is a very nicely preserved original example. This original Vibrolux was on the edge of the student/professional grade amp dividing line in the 1950s but offers plenty of volume for most small gigging and recording situations today, with a tone that's hard to beat. The rest of the circuit is virtually identical.Īlso like the Harvard (and unlike many other contemporary Tweed models like the Deluxe) the Vibrolux is a fixed-bias amp, allowing it to have surprisingly high headroom and output volume for a dual 6V6 layout. Unlike the 6AT6/6AV6 first stage found in the Harvard, the Vibrolux uses the dual-triode 12AX7, with the added half powering the tremolo. The circuit is basically the same as its little brother, the 5F10 Harvard, with a tremolo feature added on introduction in 1956 this was smallest Fender amp with built-in tremolo. Not to be confused with the later Tolex-clad 60's era descendant, the tweed Vibrolux 5F11 is a relatively compact combo amp with one 10" Jensen speaker and a dual-6V6 power section putting out around 10 watts of power. This one has a tube chart stamp reading IK, indicating it was assembled in November, 1959. The 1950s tweed Fender Vibrolux marks a special debut in Fender history: the built in tremolo effect, introduced with this model along with the larger Tremolux. Fender Vibrolux Model 5F11 Model Tube Amplifier (1959), made in Fullerton, California, serial # F-02694, tweed fabric covering finish.
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