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When VOX re-designed their AC30 and removed the EF86, they added a Top Boost circuit to regain some of the high end sparkle the amp had lost. What was used was the high gain circuit from the 1954 Gibson. The interesting point is that the original Gibson diagrams happen to have an error on the Bass pot, grounding one end that should be left floating.

Read about the Real origins of the Top Boost circuit and why it was a mistake! The article is by Glen Lambert

http://www.geocities.com/vintage325/topboost.html

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

The Vox "Bass pot error" is also in the Matchless Hot Box.
I'm making a copy of the Hot Box right now with the "error" in place.

My 65' AC50 also has this tone control setup. When I made a single
ended 5W amp I also used this tone control type.

Lucky mistake for JMI... I guess they thought: If it sounds good why
change it?

Yes it's a unique circuit. You can defeat the interactiveness by unsoldering the ground connection from the Bass pot.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps