Which tube configuration is often found in Thivan Labs, and what is important when replacing or upgrading it?

With Thivan Labs, the overall picture is mainly shaped by classic single-ended Class A concepts. The Flamingo 300B uses 300B, 811A, 572B, 12AU7, 6SN7 and 6V6, while the Eagle 845 uses 845, 12AU7, 6SN7 and 6V6. Especially with these amplifiers, it makes sense to consider the power tube and the preceding driver stages as one coordinated whole. Many suitable tubes for Thivan Labs devices are available from BTB selected, and power tubes are also available on request as matched pairs or quartets.