May i know whether modify the HD-21 same as HD-22?
If i would like to change the capacitor step by step (not a the same time) which cap should i change 1st (which cap will give more effect after change?
1) the 2 cap near power supply (220nF or 0.22uF) OR
2) The 2 white cap (2u2,400) or
3) the SCR cap?