Need Help with Acoustat Model 4 speakers

Skykomish, I used to own Model 3's with the 121 c interfaces. As others have said, the speakers need to be plugged in all the time. Acoustats are fairly difficult to drive, although a 50watt tube amp should do the trick. One other thing about these speakers is that they could be damaged by arcing, like most stats. I had a friend with 4's who managed to arc them severely and that was as they say that..:0(
After about ten years with the 3's, I gave up on them and now I never look back.

Guys:
I just bought a pair of Model 1 +1 with the Hafler Medallion 141C transformers. Like the OP, I could only get faint volume out of 'em, even with a very good 150w amp. (I did plug them in). I opened the transformers up, and the fuses all appeared intact. The guy I bought 'em from, who appears honorable, claims they worked perfectly, but hadn't been used for several months. Being largely moronic about electronics, could it be something as basic as the capacitators needing charging? Your help is most appreciated.
Clueless in Chicago

It could easily be that the capacitors need to be replaced.