A further update. For anyone who cares! I picked up an Altec 418-8H speaker recently (probably a ’72), 150w, AlNiCo. A really great speaker and a perfect match for the Custom Vibrasonic. The quest is over!

So, that experiment didn’t’ really work out! Serious lack of bottom end. Presumably due to an impedance mismatch. The Big Ben is 8ohm where the amp wants a 4ohm load. The original speaker is back in for now. I’m considering having a second baffle cut for a 2×12″ configuration. I’ve got a pair of Eminence Canis Major drivers to test out with this set up. I’m guessing this will dish up some fairly standard Twin Reverb type tones. Cheers

Hey everyone, I have been lucky enough to pick up a 96 custom vibrasonic a couple of months ago. Wow! What an amp! It came with a cheap replacement 15″ speaker (qtx) which was really preventing the true tone of the amp from coming through. I disconnected the 15″ speaker & hooked up a 12″ Eminence Canis Major in a closed back cab for a comparison test and the first thing I noticed was a considerable increase in volume. It sounds like a 100 watt amp now with classic Fender clean tone. I have ordered a 15″ Eminence Big Ben to use in the combo and I’m hoping for similar results to the Canis Major. Obviously the tone will differ a little as the Big Ben is ceramic vs the AlNiCo of the Canis and the closed back vs open back factor will undoubtedly play a big part. I will post an update next week after I have installed the Big Ben and had some play time. Cheers