Not much experience with tube amps, mainly sold state or hybids. Have had MF X-CANS V2s and V3s, but, to me, this little amp blows them out of the water. I've extensively modded my V3 (caps changed throughout, better tubes, resistors, even Paper-in-Oil capacitors in the output stage) and still this little amp is better, although the differences are more subtle. If the 332 has a fault, it is that it it too revealing (at least with the present compliment of tubes: 2xM8100s and 2x6S19P-Bs), and could ruthlessly expose a bad recording or an inadequate source.
DennyL may be right - tube life may be shortened. But replacements are so cheap (at least at the minute) that it doesn't really matter. The SVETLANAs I'm running right now, the 6S19P-Bs (the improved, mil-spec version of the standard 6S19) are very durable, long-life types, and I got 10 of them for £9.59. The output tubes are also widely available, and again cheap. 5 Mullard M8100s, again a mil-spec, high quality equivalent of the 6J1, for £2.59. (this tube again has a long-life - about 10,000 hrs.) I would advise anyone looking for these tubes to look for the equivalents: look for 6J1s and you simply get the Communist Block version of this tube - 6J1P or the 6J1P-EV. Look for the many western equivalents: 5654 (W), the 6AK5 (W), EF95, M8100, CV4010, 6F32, etc, etc.
The 332 is extremely powerful, and can drive higher impedance cans, like the SENNHEISER HD650s, with ease. I can barely listen to this amp above 2 on the volume control without the fear that my ear drums will explode.
The QED Conduit can be picked up at most good electrical shops or on the internet. Brilliant cable for the money (approx £35-£40) - well worth it.
I think you're right, the LITTLE DOT 2++ does share its power tubes with the 332 - the 6S19 (the English designation of the Russian 6C19). Smaller tubes, however, are different - the EF92 (CV138) I think.
P.S. Budgetphile, don't twitch anymore, seek the cure before it's too late!!!