I've done some research.
The MC7300 and the MC300 are actually very much the same amp.
The volume pots are on the back of the MC300. Also the case got a lot deeper as to give more room for the electronics. Same powertransistors, the driverboard looks completely the same on pictures.
I've got the service manual of the MC300. The bias can be adjusted, but there is no information how to do it. I've seen TP1 and TP2, which are both marked with 0V. Can this be the Testpoints for the Bias? Connect the Voltmeter across TP1 and TP2 and adjust on 0V ??
I have bought a original Service Manual of the MC7300 on Ebay. It's on it's way to me, when I have it, I will put it here for all of you.
The C39 is still with me, with the same problem. Sometimes the Volume doesn't work when powered on. The motor turns when using the remote, but the level doesn't increase/decrease.
Happy listening!!
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