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30th January 2012, 06:44 PM
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#61 |
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diyAudio Member
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
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The triac in question is not the crowbar that shorts the speaker output to speaker return. It, or something like a SS relay, might be in the incoming 120 VAC to the AC transformer, to turn it on and off.
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Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500 |
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30th January 2012, 11:05 PM
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#62 |
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diyAudio Member
Join Date: Sep 2004
Location: Lansing, Michigan
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The triac in question is a large TO3 type riveted to the bottom floor of the amp. It is a type Q4025 or Q4040 or similar. The power switch merely turns the triac on and off, the triac controls AC current through the power transformer primary. Triac shorts and leaves the amp always on.
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