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My Boogie has dropped its volume to something like half and is making weird low volume fuzz tones. I've changed the preamp tubes to brand new JJs, that didn't work. I changed the power tubes from year old TADs to brand new EHs. The EHs burned up. I turned it on to burn them in and after six...

I read on Santana's website that he has a Phillips 12at7 in his main Mark I. It doesn't specify which position it's in, however. Does anyone know?

Does anyone know which tube runs the lead and which the clean channel on a .50+?

Does anyone know of any way to soften a .50+ tonally? I find it's really bold and punchy even with lots of gain. That's a good thing a lot of the time, but other times I'd like a little looser feel and sound--not so much spank. Any ideas?

Can anyone tell me if I can run kt66s in my .50+?

I've just joined the board. I own a 1990 50.+ head which I love. But it's a little too strident. Does anyone know what exactly the tweed switch is? I'd like to mod my amp to use it. I kinda thought the eq switch (which I don't use) could be rewired in some way.