so if i play my 5150ii the high end will cut in and out. if i tap the top of the amp with my hand the high end will pop back in and it sounds normal. also when i take the amp off of standby there is a scratchy noise and then it goes back to normal. any ideas what this could be? ive been told it could be one of the following issues: power tubes, cap is going out, transfomer issue,

Live Rig
Michael Kelly Custom Shop Plum Telecaster
Michael Kelly Custom Shop Plum Patriot

EVH 5153 50w
Jet City 2x12
Custom Board

It is NOT trash metal it is tHrash metal...get it right
It could be one of the following issues:
-power tubes
-cap is going out
-transformer issue.
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Aw yeah.
My guess:power tubes
'93 Gibson LP Studio (498T/490R)-Ebony
'14 Gibson LP Standard (JB/Jazz)-Ocean Water Perimeter
Epi MKH LP Custom-7 (SD Custom Shop JB-7)-Ebony

Maxon od808|Boss NS-2|Boss CE-5|
Line6 G55|Korg Pitchblack Pro

JVM 210h|1960a(V30/G12t-75)
Take it to a tech and have them give it a once over if you don't know what to do.
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate