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i buy a used mesa 50/50 power amp (the old model) that was made in 1998 i think. The guy that sell tell me that never change tubes, and he not play too much it. I check the amp, and tubes looks to be good (sounds great) but have a little problem that i think it is not the tubes becouse the unit...

Hello, i just buy a used formula preamp in Ebay, i will receive it next week. I'd like to have the Andrew's mod instructions to mod it. Thank you My e-mail: [email protected]