sir try niyo po muna alisin isa-isa yun tubes then linisan niyo po yun pins using old toothbrush slightly dipped in alcohol po.. better kung masundot din yun butas ng tube socket sir.. palagay ko po burnt dirt po yan nagsilbing hindrance between connectors/pins/audio path..
if na-linis niyo na po thoroughly and dry ang mga tube pins/socket.. time to test na po.. if the cracklings doesn't go → malamang po one or more tubes were compromised.. try replacing it with your spare tubes po.. kahit pa isa isa lang po to see what tube were compromised..
QUESTION: naiiwan po ba yun amp sa aircon then papatayin ang aircon.. or say na-lamigan then naiinitan, repeatedly po?
PRE-ANSWER ► ang mga connectors po ay metals.. sa lagay po ng tube amp, theys are tube pins and socket.. lahat naman po yata ng metals are permeable to vapors → kapag nalamigan sisipsip ng vapors or lamig then kapag naalis sa malamig na lugar or say pinatay ang aircon eh magpapawis..
Now yun pawis po madalas may kasama na pong micro-dirt or micro-chemicals.. na kapag natuyo po eh nagsisilbing thin layer of dirt/corrosion.. nae-experiene po natin ito sa mga in/out jacks ng pedals natin at plugs ng guitar cables natin.. ►►► minsan kailangan pang alisin sa pagkakasaksak ang plugs ng guitar cable at isaksak ulit or iikot ikot para po matanggal ang thin layer of dirt/corrosion para mag-conduct ulit.. ¶ either we experience cracklings (sometimes parang watusi or statics (brown noise) tapos may attentuation sa audio ►►► mahina ang tunog mo than the usual tapos may halong noise sa background (crackling or static)..
at your service!
-Emil
