VH2 issue. Tubes going bad or something else

Tone Junkie

Well-known member
My VH2 just started loosing high end and volume would drop by at least 50%. This happens on and off. Lasts for maybe 5 to 10 seconds.
Amp hasn’t left my room. Tube issue or something else.
If it is power tubes and they need changed how do the KT77 sound compared to the 6L6 that are in it.
Which brand of tubes are good replacements.
 
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