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Check your cables - I've had similar problems with various amps playing various guitars; the guitar electronics and the amp electronics are fine, but the cable is damaged internally and this causes the same problems as you have described. Have you tried using a different cable? Buy a different one, try it out, and see if you have the same problem. If you have a friend who plays, let them plug their cable and guitar in the amp - if it works, your faulty cable is the issue. Hope that helps!
If it worked before you changed the tubes, it is possible one of the replacements (probably a small tube) was bad... it happens... Another possibility is that a socket pin has gone bad or a pin has broken or bent off... again probably one of the small ones... 12AX7/12AT7 or equivalent.
Swap old ones back in one at a time.
I would try hitting the side of the amp before turning it on. There may be a loose piece of solder or other conductive particle stuck somewhere. Bang the cabinet rather hard with your fist. If that doesn't help it might be a loose solder connection at a resistor or capacitor but a tech should check that out.
try this: plug a stereo headphone into send & check if you get something on one side of the headphones (should be left side) if yes check the cable you use, it's possible that a mono plug (as used for guitars) is disabling the send output, using a stereo plug & adaptors may work (especially if you get the sound in the right side of you headphones
check also the manual you may find a description how to connect/insert a guitar effect when recording or live mix
Personally, I like to have all "tone effects", such as wahs, distortions and equalizers in front of "time effects" such as phasers, chorus, flangers and delays. See my set up in the photo. Guitar input is from right to left, starting with the wah pedal.
Tom, 30yr player
Nine times out of ten, any problem with an amp having no sound coming out, it's a wiring issue. Make sure all of the wires internal to the amp are propely hooked up. Also, try switching out the quarter inch cord you are using from your guitar to your amp. Could be a bad cable. Unless you have blown the speaker completely, something is loose or not hooked up properly.