Through the YDA147 data sheet I found that the input of this power amp is on pins 5 and 9 and these inputs need to be connected through a DC-cut capacitor of 1uF. Reading the features of this small beast I realized how technology has developed! Have a look at the full data sheet: The power amplifier for the THR10 is the tiny little IC (Integrated Circuit) called YDA147 capable of 2 x 15W and other amazing performance: I used to be an Electronic Engineer, very old fashion guy, I can be good in building some tube amp - as I did - and understand discrete components amp. I followed the logic that the THR10 is a Guitar Amplifier! It seems stupid statement but, it is what I used to realize my modification and… it worked.Īs any Guitar Amplifier there is a preamp and a power amp. ![]() ![]() This connection basically takes the output of the pre-amp, send it to an external Effect Chain (for example a Loop Station) and receive the signal back to feed the power amp. ![]() The THR10 YAMAHA is a great little amp (for me, so far, The Greatest) but doesn't have the Send/Return (Loop FX) connection.
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