Dynaco Power Amplifier Rebuilds

For Dyna amp owners, we install new circuits with free repairs!

The original Dyna audio circuits are now obsolete and on their last legs. So, we strip the old circuits out, problems and all, saving only the chassis and durable parts. There is no repair charge assuming that the mechanical bits such as the power transformer and chassis hardware are salvageable. If not, we will have to charge extra for their replacement.

For our solid-state rebuilds, we install new Insight circuit boards of our original design and new power MOSFET output transistors. Except for chassis and mechanical layout, our solid-state power amp rebuilds are identical to our brand new Insight amplifiers. Our solid-state amplifier rebuilds are available factory-installed only.

For our tube amp rebuild, we install new Ultimate 70 circuit boards of our original design and new output and signal tubes. We improve the power supply circuits and restore your switches and jacks with DeoxIT D5 cleaner-preservative. Input jacks are replaced with gold-plated ones where applicable. You pay less because you save the cost of a new chassis. Our tube amp rebuild is available factory-installed or as a fun do-it-yourself kit.

	Dyna St-70 Rebuild: Ultimate 70 The Ultimate 70 has solid bass, pure and liquid highs, and a marvelous sound stage. It is faithful to the spirit of the music, absolutely pleasant, and rewarding to listen to on any rationally efficient loudspeaker.
	Dyna St-120 Rebuild: Insight 170 More power and absolute state-of-the-art musicality in your St-120 chassis. Everything old goes—all the way back to and including the power transformer. Our best sounding solid-state amplifier and likely the most musical and transparent at any price. An outrageous value—your 85 watt per channel Insight 170 will outperform other amps costing thousands, proving that superior engineering does not have to be expensive.
	Dyna St-150 Rebuild: Insight 240 The most transparent and highest definition 120 watt per channel solid-state amplifier in existence and available in your St-150 chassis at a significant cost savings to you. If your St-150 has working meters, they will be interfaced to our circuits.
	Dyna St-400, St-410 and St-416 Rebuild: Insight 400 Gobs of high definition and transparent Insight power for your Dyna St-400 and St-410. Our best solid-state circuits at a crushing 200 watts per channel. All original Dyna audio circuits are eliminated. You get the same wonderful detail and musicality of our new Insight amplifiers but at a lower price. You won't believe the transformation!