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EH 7591 Opinions?

Thanks Larry.

All of the old 7591's I've seen,regardless of manufacturer,seemed to use the 5-ply plate metal developed by Texas Instruments. Might explain how they managed to stuff so much dissipation into such a small bottle and maintain stability/reliability. I wonder how (if?) Tung-Sol has addressed this issue? Could also be why the EH examples are so large.
 
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