5f11 Output Transformer
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Its date code corresponded with 1963 and 1973, but the cloth-covered wires suggested the latter. Ed and I discussed sourcing a Triad #108 replacement, but further research revealed Fender began installing Schumacher 125A1A output transformers in the Vibrolux from mid-59 onwards, so we decided to keep it.
Remember that a Princeton output transformer had already been fitted in this Vibrolux. My findings may have been different with a Triad #108. In a sense, this Vibrolux has ended up with a tweed preamp running into a blackface-like power amp, so it overdrives and compresses nicely, but the power amp prevents excessive sag.
Another big difference between the Vibrolux and a 5E3 Deluxe is the use of negative feedback. Fender would connect the positive from the output transformer to a point in the preamp circuit to stabilise the amplifier and increase the clean headroom.
This 1957 Fender Vibrolux 5F11 has just come out of the original owner's basement as is ready to get back to work. It's in good solid original condition with only a three prong power cord and new power switch for repairs. I sourced a proper set of genuine NOS matched set of Sylvania 6V6 power tubes and GE rectifier and preamp tubes. The original handle had long since deteriorated so I've replaced it with a nice looking vintage handle. All other parts are original to the amp including the important Jensen P10R speaker and both transformers. The tweed is in good condition but does show signs of being in a dusty environment. The chrome control panel shows pitting and what looks like a mark from a crayon. Rest assured that this one won't be mistaken for a 1990s reissue. They'll know from that classic look and tone that it's a holy grail pre-CBS tweed Fender amp.
Description: Great vintage type upgrade/general replacement output transformer! Paper Core like the originals. 4K Ohm Primary Impedance. Mounting holes centers 3 9/16". Width of core 2 1/2". 2b1af7f3a8