How to test a Bi-Directional Triode Thyristor

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The discussion revolves around troubleshooting a Carver model M-1.0t stereo amplifier, specifically focusing on testing a Bi-Directional Triode Thyristor (triac) that controls the AC input to the transformer. Participants suggest various testing methods, including measuring gate voltage across R409 and using a light bulb in series to observe the triac's behavior. There is a consensus that the triac regulates power and may act as a safety feature, with concerns about potential faults downstream in the amplifier. Suggestions include checking the transformer output and considering the triac's replacement with a modern equivalent. The conversation highlights the complexity of the circuit design and the importance of careful testing to avoid further damage.
  • #151
Referring to posts #146 (by Jim) & #147 (by Tom) above, the speaker current feedback seems to be explained here:

Particularly in the graphs at the bottom of post #5.
Small Amp Project (Tube/power stage info needed)
 
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  • #152
Good eye Tom !

I hadn't caught that in the Carver,
i only assumed they used current just to invoke a power limit.

But it's right there on the block diagrams , page 8 of service manual.
And specification page says
Damping Factor Greater than 9 - Tube Characteristics

Thanks !
 

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