Tuyen. You need to ask yourself, do i what it to sound brilliant or just good enough. There is a lot you can do, but you need to really listen first and then based on its sound, develop a plan of attack. The 2.2uf 100 volt Duelund are perfect. I see there are Riken 2 watt resistors. Riken have a strong flavour and generally do not make a prefect choice for most applications, But they can fix out of tune parts combinations, because of there veiled dark grainless sweet character. But if you what perfection, they must go. Initially another resistor combination may sound worse, (2 watt Allen Bradley is a great first choice). But you will need think laterally, about the big picture. The other resistors look like 5 watt TRW or whatever. All 5 watt resistors I have heard are ordinary. Chuck them and run 2 watt Shinkoh or possibly even audionote 2 watt, (they could be interesting). Mount the shinkoh on the metal case with heat transfer paste, that will dissipate the extra heat into the metal case, because at 2 watts the shinkohs are underrated for this position. Look at the picture at the far right, that shinkoh is a 2 watt in a 5 watt position but by mounting it like that, it can take the extra heat and sound so much better than any 5 watt resistor. Black Gate Capacitors Have great strengths clean, clear, big sound stage, detail, but that means nothing to me, because they have very poor musical involvement, they have a sterile, unmusical quality, You need to get rid of them, and get some big Solen PBs and bolt them on where you can fit them. I see so many things to attack. You need an understanding of the sound of the parts you want to use, it's hard trial and error. Anyway it never ends,