Where can I get reliable and high-quality high-end tubes for Octave amplifiers?

With Octave, the tube choice is particularly interesting because many amplifiers are not limited to one single power tube type and therefore deliberately offer room for a suitable new configuration. This applies, among others, to V 40, V 40 SE, V 70 SE, V 70 Class A, V 80 SE, V 110 SE, MRE 130, MRE 220, MRE 220 SE, HP 300, HP 300 SE and HP 500. Especially with used units, it often makes sense to first follow the previous or original tube configuration and then decide specifically in which direction the amplifier should perform. In many Octave models, 6550, KT120, KT150 and KT170 are used; for example, 6550 JJ, KT88 Genalex or also the KT88 Carbon S4A have proven themselves very well here and perform very coherently in many Octave amplifiers. With the Jubilee models, however, the selection should always be matched more precisely. Many suitable tubes for Octave are available from BTB in selected quality, with power tubes also available on request as premium matched pairs or quartets.