Hi Ipretiring,
Is there a particular SET amplifier you have in mind? I haven’t heard the Dynamo MK II but sources I trust say that it is a "very" good sounding amplifier. It uses the el 34 output tube in a SEP (SINGLE ENDED PENTODE) as opposed to a SET (which uses directly heated triodes, 2A3, 300b, 45, 845 etc.). I do have a bias toward DHT and believe they offer the musicality is its purest and most natural presentation.
However non DHT pentode/tetrode tubes in the hands of talented builders with good ears can and will sound terrific! A good quality DHT SET is going to cost more money with rare exception. It depends on your budget limits. The DIs certainly seem to be a true conduit and reveal what comes before them in the signal chain. If you are after the upmost in terms of transparency, tone and nuance and have the budget I believe that you’d be very pleased with DHT SET. For example the Triode Labs 2A3 SET mentioned here several times by teajay would be an excellent option to consider. I use the Coincident Frankenstein MK II 300b SET which has served me exceedingly well x 8 years. You have many fine choices with the DIs.
Charles