With tubes it all depends on how many hours you have on them ,if used often it may be well overdo for tubes to be replaced , and if you have these new modern tube even more so ,I buy only NOS tubes night and day better quality on many levels ,and the small input tubes you can even voice your tone .
speakers that old the capacitors on Anything are drying out gor sure
I have been modding o for over 20 years and capacitor technologies has greatly advanced. I still see people using electrolytic capacitors in speakers ,why for its cheap and sound like crap very gritty , I just rebuilt a so called crites upgrade
A electrolytic on the bass $4 i I use poly caps ,or Foil capacitor depending on budget ,if you have to go cheap and use a electrolytic cap at least put in a 2uf poly or mylar cap on a 100 uf bass cap to filter the highs ,electrolytics belong in power supplies,even they filter with a poly cap if done right , most mfg under $10 k use cheap Xover parts Solen good enough and cheaper ceramic resistors . I refuse to go to their standards ,it’s a petpeave with me , you get what you pay for .