What is the failure with the ST-70?? The power transformer? If no, its probably cheaper to fix it than move on, unless it wasn't doing the job for you.
Advice on replacement of Stereo-70 (for Cain& Cain Abbys)
I've been saving up for an Audiokinesis Swarm, but my Stereo-70 mk II died yesterday. I had already targeted it for eventual replacement, but now I need to shift my attention to an amp and put off the swarm. My speakers are Cain&Cain Abbys. A Van Alstine Ultravalve would feel familiar and be a significant upgrade, or I could go SET (I've looked at Decware, Coincident Dynamo mk III, and Dennis Had's Inspire SEP). Or, in a different direction: LTA ZOTL 10 mk II or First Watt F7--though they both lie at the very top end of my budget (actually a bit beyond, but...). All these amps have their fans and seem like excellent values. But I want to get it right because this will probably be the amp I use for the foreseeable future (and there is no way to audition!). Thank you for your thoughts, I've learned a lot from reading you guys.