#1
I have an amp that i've been playing for a few years just like this one....
http://backstage.musiciansfriend.com/productDetail/productDetail.jsp?CJAID=10381297&CJPID=1729381&entProductId=483125

and now it wont work. the power turns on but when i plug a guitar into it theres no sound. I opened it up and everything looked fine so i'm guessing the tubes just need replaced?

if thats the case then how much will this cost? is there just 1 specific tube that just needs replaced or would it possibly be multiple ones or all of them?

this was my dads amp so I don't know much about the inside of it or how it works. He's had it for awhile so its got a good amount of years on it.

also when you lift it up you can hear something rattling inside of it (the sound is similar to like a broken lightbulb or something). my dad says its been doing that for years but it still worked.

so yeeeeah please gimme some advice
#2
well the rattling could well be the reverb tank.
and also, you should replace all of the tubes to be on the safe side, especially if they're pretty old
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#3
I would bring it to a music store and ask them to take a look at it. Maybe there's a problem with the guitar, or even your cable.

Tube costs vary depending on the tube that you need. I presume since it's a Marshall it'll need an EL34 but again, take it to a music store.