T
TheArchitect
Guest
5881's are military spec 6L6's. They were designed to be a bit more compact and durable than commercial 6L6's of the day. They are essentially the same tube and are interchangable with 6L6 tubes.
As far as KT66's I am not sure that can be done properly without a transformer change but I may be confusing them with KT88's.
NOS tubes are pricey and are hit or miss in terms of quality given the extreme age of most of them. Personally I would put a set of JJ 12ax7's in the preamp and a set of Svetlana 6L6's in the power section.
I have 2 Bassman heads. An early 70's silverface and a 66-67 Blackface. The Silverface is stock but the Blackface had the bass channel modded to Marshall style specs. Killed vintage/resale value but it sounds awesome. Fair trade in my book.
As far as KT66's I am not sure that can be done properly without a transformer change but I may be confusing them with KT88's.
NOS tubes are pricey and are hit or miss in terms of quality given the extreme age of most of them. Personally I would put a set of JJ 12ax7's in the preamp and a set of Svetlana 6L6's in the power section.
I have 2 Bassman heads. An early 70's silverface and a 66-67 Blackface. The Silverface is stock but the Blackface had the bass channel modded to Marshall style specs. Killed vintage/resale value but it sounds awesome. Fair trade in my book.