I have a Vibro Champ and a Vibro Champ XD... is there some way to boost the power by changing the tubes??? ALSO, I needed extra power recently, so I set both amps up and ran my guitar into a Y-adapter, then into each amp... could I have connected them some other, better way?

Nah, just changing tubes won't give you more power. It's more complicated than that.

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Go from the Line Out socket on the back of the Vibrochamp XD into a PA.

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No no and no

Or just mic it if you can. Either way will work unless you don't have access to a PA system.

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Life...... It's sexually transmitted and always fatal

You could have used a clean boost in both chains.

Something like this :

http://www.amazon.com/BBE-Boosta-Grande ... B000K69V6I

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Being able to play and enjoy music is a gift that's often taken for granted.

Don't leave home without it!

The BBE are nice pedals. I like the EH LPB1 and the Seymour Duncan Pickup booster too.
http://www.seymourduncan.com/products/s ... pickup_bo/

You have to be careful with boosters and small Class A amps. They tend to get driven to total distortion. You can also damage the speaker if it's not rated for a high enough wattage. Fun stuff though if you use the wisely.

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Life...... It's sexually transmitted and always fatal

Those tubes can be like a torture chamber for the speakers.

_________________
Being able to play and enjoy music is a gift that's often taken for granted.

Don't leave home without it!