what are the advantages to having a lot of tubes, assuming that you have very efficient and sensitive speakers (the OP has some very efficient Klipsch speakers)?
There is less advantage in this situation. What such speakers do allow is that you can have a situation where clipping the amp becomes impossible (we have lots of horn customers...). That in itself is valuable but not germane to the thread.
IIRC, Atmashpere's comment has to do with better impedance "matching" between his OTL amps and speakers.
This is incorrect; what I said was if one is to have multiple output tubes it is better to have a lot than a few. IOW in a larger transformer-coupled amp this holds true just as it does in our OTLs. This, as I mentioned previously, holds true as long as there is a means to allow for current sharing between the output devices.
