Fair point about the NOS valves, I hadn't considered that. Amplifier circuits are basically all from the fifties and sixties, even class D is not new but from the early seventies.

Quote Originally Posted by Marco View Post

Even my Ortofon tonearm is based on a 1960s design. And of course the Techy itself was first introduced in 1972, and has changed little since then, albeit mine is now highly modified with the use of modern components, which is where the genuine advances in audio have occurred (ditto the crossovers on my Tannoys).

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There aren't any new materials in the Techy mods, there is nothing they could not have done in 1973 given the budget.