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This is a NA model with a 4A slo blo fuse. It won't blow in stand-by; but, about 8 seconds after switch on it fails. My thinking was the filter caps. And yes, excellent advice and thanks for steering me there without solving the problem for me.

Thank you sir. 40 Watt bulb. I will check the voltages.

Fails after first tube goes in, within 8 seconds. Light bulb starts to glow brighter, then....loud buzz as before and fuse blows.

I built light bulb limiter today and tested the amp without any output tubes. Fuse OK. Now to the nervous part; move on and put back one tube at a time. I'll post news after I dig up some bravery.

Thanks for the advice. There's always "one of you" around forums

I have seen the light bulb used in radio circuits. Great idea.

1997 amp. There are no hotspots anywhere on any pcbs. All of the caps look original and new. No swelling or leaking. I tested all of the tubes with a tube tester and are in great shape. The mains fuse will blow after 5-6 seconds of power on. I think I should recap it. Check resistors. What would...