For many, this amp is the undisputed Heavyweight Champ, Holy Grail, Supreme Leader and Be All End All of tube guitar amplification. The implications of Cliff getting his hands on one is the stuff of legend.
Quick Dumble History from various reading I remember over the years (don't quote me exactly..):
Dumble was probably the first 'boutique' amp builder. He made a small number of amps (less than 300?) from the 60's to the 90's. You couldn't simply buy an amp from him. It took more than money. He had to deem you worthy, either already a famous musician or an amazing player. If you met his eccentric criteria he would agree to work with you and build you an amp. He would 'voice' each amp to the player, so no two were exactly the same. He built several distinct designs, of which the 100w ODS became the most highly revered (not the rarest). At some point (way before digital, and before amp mods and 'clone' builders became common), he realized that other builders were snooping inside his amps to learn his secrets and make schematics. So he started putting dark epoxy 'goop' over the preamp circuit to hide all the components. Of course, that didn't stop cloners.. some amps had the goop painstakingly removed. Schematics ARE out there, and there are several well known D-influenced amps in the market (Two Rock, Bludotone, Fuchs, etc).
The question is, how accurate can clones be when there were so few original amps, very few of which were ever examined\measured by builders? You can read discussions about this for years on other amp forums.
. not sure though if Dumble's gonna be real happy about this 
