I haven't used mine for over a year. Got it on yesterday and noticed the voltage meter on the PS is maxed out. It used to show about 50 volts (idle) for normal operation and about 40 volts for RTTY.
I'm a bit puzzled because the PS doesn't even have a voltage regulator. Other than that the amp seems to work fine and puts out about 450 - 500 watts with 100 watts in.

Check your line voltage, it may have gone up. The meter circuit may have bitten the dust too.
73,
Rob

Line voltage is the same, 125VAC. It's a bit on the high side but it hasn't changed in the last 15 years.
User manual has a schematic. The transformer secondary has two taps: 65 VAC (normal) and 43 VAC (RTTY). It checks ok. Also, I measured 67 VDC (at idle) on the large capacitor (after the rectifier bridge). This is what's questionable. I don't know if it's normal or not, since there is no voltage regulator circuit in this power supply.