Having some lag in power at key up. Dead keys 80 then few seconds goes to 100. Have checked tubes and they seem fine on tester.
It has the 8950 in a 6lf6 wired socketThe tube tester can never put a full load onto the tubes.
And your tubes are misbehaving only after a few seconds of full load. Good chance the trouble is one or more tubes.
Is this a Skipper?
Or a 300A?
73
This site has the best prices I've seen for the 6KD6 tube set for the 300A...I would call ahead tho to make sure they still have them before ordering...Actually this one was on facebook marketplace.
according to page 3 of the owner's manual you can...Can you use 6lf6 tubes. I have 15 of them used have to have them tested