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Question and comment on tube matching

You wrote, "As these amps are manually biased there is no need to have precisely matched tubes." Did you mean to imply that each separate tube can be individually biased? If not, if instead you are manually biasing the tubes in the positive vs the negative phase collectively, then there would be an advantage in using matched pairs or better yet a matched quad per monoblock. In fact, even if you are able to bias each tube individually, there is still an advantage to be had in using matched sets. Biasing is done when the amp is in a static, no-signal condition. Even if DC bias is spot-on, this does not protect against the probability that individual tubes behave differently when passing the AC audio signal under dynamic conditions. Even matching the tubes somewhat alleviates the problem, but it is not a panacea. This is no indictment of your particular amplifiers; the problem is common to all tube and even ss designs that use paralleled elements in the output stage.

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