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RE: A2 won't mess with the bass

The problem with this scenario is that the additional power in A2 won't be sustainable at low frequencies. Unless you have an output transformer the size of a mini-refrigerator, output power will fall dramatically below 100Hz. This means the only remaining advantage to "capacitorless" coupling is the elimination of blocking distortion at higher signal levels.

If the OPT is designed to be able to play the bottom octaves with the power of the amp the class of operation isn't going to affect it. Admittedly, getting this sort of bandwidth with this much SET power is challenging and usually transformer designers opt to get the highs right rather than the bass.

If you are concerned about LF saturation due to a cheap output transformer, simply limit the values of the coupling caps prior to the driver (in this case, the EL34).

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