Input impedance for the calculation of imput cap is the volume impedance gotcha! I now have pretty much all info to mod this great little amp, danke schöne meinen herren! I know that electro caps in the signal is the worst and I will switch them as soon as possible. We are not debating it here! Sadly my seller doesn't have 130µF in stock and the delay is two months, a downer... I think I will use two 100µF and two 30µF(to fit the case) per channel. Isn't it to detrimental to use four caps instead of two soundwise? Also I want to replace the last power cap but I fear funds are not allowing it. So is it possible to only add another film cap lets say 30µF at the end of the CRCRC filter and keep the benefit? Lastly i will change the elec imput cap to film ones, four 22µF is cheap enough!