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Donor H/K A224 Amp

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Hello All.
I'm new to this forum and also pretty new to the tube world so please forgive me for the very broad question that I am about to ask.
I have a Harmon Kardon A224 Integrated Amp that badly needs updating (caps and resistors) but is still operational. I was thinking that with the needed reworking, and my desire to never leave things alone, maybe I would be better off to use this as a donor to build a little more up to date amp without all of the excess, unnecessary controls. In case you are unfamiliar with the 224, the unit has 3-12ax7, 2-12au7, a 5AR4 rectifier and a quad of EL84's.
And finally for my question: Should I just replace caps and resistors and leave it be or should I turn it into a donor?
If I should use it for a donor, Any interesting ideas/links on what to do with it?
Thanks for bearing with me.
 
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