I have a pair of the A-250's and I really like them
Picked up a pair of A-250's at the local GW for about $20 the pair, figuring that given they're Dynaco they should sound pretty good, and looking at the components i figured if the tweeters alone were still good, it would be worth the $twenty.
I'm very, very pleased with them - I keep the mids at about seated ear-level and find that they have very excellent imaging - those Polydax tweeters to my ears are very, very fast - giving an excellent reproduction of jazz cymbals, violin, female vocals, jazz organ... can't fault them on any level. They may not have been from Dynaco's heyday, but if you can find a pair of the A-250s, I'm quite sure you'll find they will reveal the details very musically in your favourite source materials.
Plenty of solid low bass, as well.
The only problem with mine is that one of the rubber surrounds has split radially just a little bit, and the rubber is showing the evolution of a crack at the "elbow" where the surround roll meets the face of the speaker frame basket. I'm going to research here how I might fix that... I'm thinking of trying rubber cement and a layer or two from one of those thick black children's balloons - the type that you can inflate to about 5' across - they're pretty sturdy.