The Blackjack 21 top for Fuchs ODS sounds is built on a 3x 12AX7 preamp. Tuki Amp Covers and Speaker Covers (); 99,8% de votos positivos. 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). They are handcrafted in the same US factory as the larger ODS-Classic and ODS-II. . It also features an adjustable.