In any case it is presumptuous to think you can emulate the tube sound without using tubes.
That's an endless debate around here. For a while I gigged with a SIB FatDrive and it did a nice job with a single tube. Have to admit I prefer my Monique, but the latter has more tubes and is heavier than the FatDrive. An all-tube head is yet another magnitude of weight/bulk. If you love it, be prepared to carry it!