Dynaco-Doctor Forum

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RE: New (to me) Dynaco gear

Posted by JonM on December 6, 2015 at 04:16:09:
For info on the original (including schematics), look at the link below. There may in fact be improvements in the unit you have that you'll want to keep - you'll need to figure out whether changes were made, and if so, whether they're improvements (or not).
Typically at this age, the capacitors in the ST120 are dried out and need to be replaced. So at a minimum, plan on disassembling the amp, cleaning up the chassis, replacing all electrolytics, and reassembling. If there are actual circuit mods (and not just better heatsinks added to the existing design), you may want to think about whether you want to restore the circuit to the original.
What speakers will you be using? The ST-120 had trouble with low impedances and complex loads. Something simple like a Dyna A25 is a great match; electrostatics or low impedance monsters like AR-LST's not so much.