Re: Battery eliminators
My only concern re solid state supply is its low output impeadance compared to a battery on the LT supply. The valve heaters are much lower impeadance when cold, so without additional circuitry the solid state version will cause a higher surge current in the delicate little battery valve's heaters.
The solution is not to use a voltage regulator but instead to use a constant current source instead.
TTFN,
Jon
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