TVC's, in my experience, are more sensitive to the source than the amp. If the source has an output impedance (Zout) less than 200, has a Vout higher than the sensitivity of the amp and is DC coupled, there shouldn't be a problem.
Audiogon member Tom_nice has Quad ESL 63s driven by tube amps and a resistor-based passive volume control. I've heard his system several times and think it sounds fabulous. You should contact him if you have specific questions.
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