Two of the best amps we've had the pleasure of servicing were a 63 Deluxe and a 63 Vibroverb.
The Vibroverb in particular was the best amp we've heard.
Regarded as one of the holy grail amps, only a small quantity were built between 1962 -63.
There is a particular magic to these brownface amps , a certain depth and character of tone .
Our builds are modeled on these amps.
The generous owners lend us their amps to allow us to do A/B testing, to achieve a favorable comparison to the originals.