yaqin mc100b upgrades

There are many thoughts about various Chinese amplifier designs, some have a habit of using too many resistors or people feel the best option in some cases is to remove some resistors altogether, or replace certain resistors with small capacitors.
With Yaqin’s 100B I think they generally got it right, no doubt it’s possible that small improvements can be made in some area’s, but you must be real sure of what your doing! If people want improvements then the first step is to dump those Shugang bottles & buy some decent one’s, that’s the best route for improvement, as you have already done this I would say just sit back & enjoy your amp.

One thing I have now done that gave a nice lift to the performance is to change the four input cap's. They are too small, wrong shape, low quality. I fitted some Russian PIO job's, of the same value (.22uf 275v min) go up a little if you wish to add more bass, say .47uf max, but I found .22uf was just right.