A unique circuit design mixes the wet reverb signal with absolutely no affect on the pure tube dry signal quality in any way. Fuchs Blackjack 21 MkII Mini 1X12 Combo Amp Cover - Black,Tuki (fuchp). . Tuki Amp Covers and Speaker Covers (); 99,8% de votos positivos. It also features an adjustable. They are handcrafted in the same US factory as the larger ODS-Classic and ODS-II. The Blackjack 21 top for Fuchs ODS sounds is built on a 3x 12AX7 preamp.