Every time I get tempted by an all-tube amp (even at clearance pricing) I think about how my Streamliners (600 and 900) give me as much tube sound and feel as the all-tube amp I had in the past, without the weight, with great reliability, and with zero self-noise, hissing or popping. Get a minty used one and hang onto it. It has few parallels among other lightweight heads.
Some of you new owners should check out my thread about running a Streamliner at 16 ohms to get the full tubiness of the 3DPM at lower volume:
Ran my Streamliner at 16 ohms tonight -- a revelation
I'm even thinking of trying out higher ohm loads in the future, like a 32-ohm 4x8, for low volume tubey glory at church.