You can replace with elna rubycon FRAKO or F&T caps a good size , but aware that you will have the capacity exactly the same and the voltage a 10 volt higher because of new capacitors of the same value can have a smaller size with the same voltage and capacity and the little size format can be giving a not nice sound but also all replacement capacitors in the beginning have a 2 days neccesary Black-gate or some ELNA caps much longer before it will sounds good , if you have had leaking caps like the brand of ITT if used especially the big blue ones, or nichicons clean the print outdoors with a nose pliers use on a canister gaslighter gas and spray on the free positions on the print where the leaking capacitors where placed and also to clean the whole print . it removes conductive materials and also if you have ones in your life have wallpapered indoors and have prepared wallpaper paste and this amp was in the same room you have luck by this tip because methyl cellulose can be highly conductive eventually creep and especially static seen very high electric malfunctions if you get your fingers on places without cleaning also after years !!! , and now you have your amplifier open and wish to customize it its your chance to prevent hidden faults, especially if you want to brush up on vintage equipment with analogue techniques. Yamaha vintage capacitors if you have a capacitance meter you will see if you have a capacitor that looks good in most times if you measure it you have sometimes a remarkable value because the capacitors have a strange tolerance that will not deformed down but to high 100 mf can be have an capacitance of 230 mf too great tolerance that is not a problem if all the capacitors are not replaced , but if you have checked this you will know you must replace ALL the capacitors at the same time (not the very little ones ) but measure is important or there are components that will be burning out , strange and remarkable but it could happens. good luck .
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