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    firebird 500 Power sagges then comes back?

    I have a old fiebird 500.Poid $100.00 for it.Works good pep about 375 with 3 watt dead key.When amp keyed it keys 150 when slumps off to 125 and slowly comes back.Tubes are not top shelf.Is it a tube issue or a capasitor issue.Trying to educate myself.I respect electricity and have proper toys...