#1
So yeah, I turned it on, waited a few minutes for the tubes to warm up, hit standby on and it just pops and makes feedback at a low level of volume. are my tubes in need of replacement?
-Fender American Deluxe Jazz Bass
-Tech 21 Sansamp RBI
-Mesa Powerhouse 212
-Fender Bassman 410
-Tons of other bass/guitar gear

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#2
Well, I take it that your recto won't respond when you play your guitar? It might be the tubes, might be somethin else. Take it to your local guitar store and have them take a look at it.