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Old 8th February 2010, 05:43 AM   #1
evette is offline evette  Canada
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Default Dynaco ST120/150 PCBs?

hello, can anyone please tell me how i can get blank circuit boards for thr dynaco st-150-and stero st-120, Thanking everyone in advance,
(evette)
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Old 8th February 2010, 07:02 AM   #2
DougL is offline DougL  United States
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Originally Posted by evette View Post
hello, can anyone please tell me how i can get blank circuit boards for thr dynaco st-150-and stero st-120, Thanking everyone in advance,
(evette)
You are new here, apparently.
You will get better answers starting a thread in the Solid state forum. FWIW, the Dynaco ST-120 was nominated by Lynn Olson as the worst amplifier of all time.
Good luck to you.
Really, consider building one of the First Watt amps.
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Old 2nd March 2010, 02:34 AM   #3
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Default Remember, we live in the middle

I didn't do a search to find out what a first Watt amplifier is, but most diagrams on this forum have your expensive speakers protected from that welding transformer (50 amps, 70 volts) by a little bit of silicon in a steel can. Professional PA amplifiers, by contrast, costing about $900, have speaker shutoff relays and very expensive, mostly patented protection circuits. The Dynaco Stereo 120, for all it's faults, has the speakers protected at least against DC by a couple of monster electrolytic caps. Out here in the middle, lightning strikes are a significantly frequent event. I saw lightning jump out the knob door of my TV once. I think my ST120 took a lightning strike once, I did not lose the (you can't buy exact replacement) speakers. I lost some replaceable bits of sand in steel cans. For making a ST120 sound better, search djoffe on this forum. I'm no help for new boards, I am afraid. I got mine of the dead parts shelf for $50, and repaired it without a schematic back when the internet was something the DOD used to communicate with military bases. Now that I can download a schematic, I found out how to make the protection circuit work at 6.5 amps (design spec) instead of 2 amps (by guessing). The internet is wonderful. Speaking of lightning, now about all those generator windmills that put expensive electronics at the top of a 50' steel tower! What a laugh.
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