Frank Van Alstine's has been doing this since I think the 70's. Is deservedly highly respected. He's a no hype, no b.s. kind of engineer. His products are rarely for sale.
I have a Van Alstine OmegaStar 170EX, which is an upgrade for a Dynaco ST-120. It is beautiful. The mids and highs are smooth and clear and the soundstage is amazing. I got it last summer and liked it enough that I am in the process of getting an OmegaStar PAT-5 upgrade to go with it.
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