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Old 20th Dec 2004, 8:41 am   #3
Duke_Nukem
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Join Date: Jan 2003
Location: Birmingham, West Midlands, UK.
Posts: 1,234
Default 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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