The tubes probably have low usage, so are likely to be good. Replace the selenium rectifier with a silicon diode like a 1N4004 (the current demand of this circuit is likely low enough that the selenium rectifier's internal resistance didn't make the voltage sag much at all so you won't need a series resistor) and replace the electrlytic caps. All the other caps are probably ceramic, and normally won't need to be replaced.
90 day warrenty was standard practice for all consumer electronics back then.
Last edited by wa2ise; 12-15-2005 at 02:53 PM.
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