Hi, This is only my feeling, the 120 was not one of Dynacos better amps. I had one once and hated it. There are a slew of amps out there to chose from. I'd pass on this one.
The ST120 has a cult following. It is a unique circuit, best described as a preamp on steroids...output through a huge capacitor. It was, in some regards, superior to the later ST150 which was a conventional circuit configuration. I had one for years and years. Nothing ever went wrong with it, and I think I finally gave it away.
I owned the ST120 back in the day and thought it sounded quite good. In fact, I didn't think the Dyna ST-400 that I replaced it with sounded much better although it could play louder.
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