mods for Adcom GFA 555 II

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what would be good mods for adcom GFA 555 mkII? i am looking for detailed instructions, like "replace capacitor of make A and capacitance X with capacitor of brand B with value Z". :))
i am new to this diy stuff, but i am getting some help from a hardware engineer, so i should be ok. :)) i want to improve the mids and highs. someone told me that i should replace capacitors with Blackgate caps and resistors with Vishay ones, but i am curious about the values for capacitance/resistance. should they be the same as in the stock amp? basicaly, the more details the better. i looked at other threads, but could not find any detailed explanations of mods. any help is appreciated. thanx!
 
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