Which replacement tubes and upgrade tubes for Leben amplifiers are available from BTB?

We supply suitable replacement tubes and upgrade tubes for many Leben amplifiers. These include, for example, the Leben CS-300 and CS-300XS with 4 x EL84 / 6BQ5 and 2 x 12AX7A, as well as the Leben CS-600 with 4 x 6L6GC or optionally 4 x EL34 / 6CA7, plus 4 x 6CS7 and 1 x 6CJ3. We also carry suitable tubes in selected quality and, on request, matched quality for other popular Leben units such as RS-28CX, RS-30EQ or CS-1000P. Many of these tubes are available from stock in premium matching quality. The official Leben product pages also list these configurations for the models mentioned.