There were many great articles published during the brief lifespan of "MCS Review" formerly "Quad Quarterly". Our own Sonik Wiz penned most of the technical articles. I was looking for the copy with his Pre-Synth circuit in it. but came upon his Vario-Matrix Survival Guide. This tells about all you need to know about Vario-Matrix decoding, how to maintain your equipment and even how to modify the various units.
This article is invaluable for me, as I'm about to do some maintenance on my QSD-1.
My required maintenance involves Deoxing the switch contacts. Sometimes I have to punch them in and out to get them to work. At times the sound is distorted until the push button is exercised (a high resistance contact can actually act as a diode which causes this type of distortion. Another problem is at times the bass drops out (another switch contact?) on one or more speakers, I thought that it was a bad input connection to my amplifier (as I Bi-amp), but switching over to the S&IC that problem is gone.
I plan to add the variable Hall and Surround pot to my Photolume decoder when I'm done with the QSD-1. For the QSD-1 I'll check that the hall and surround blend is correct, replacing resistors or using a trim pot if necessary.
This article is invaluable for me, as I'm about to do some maintenance on my QSD-1.
My required maintenance involves Deoxing the switch contacts. Sometimes I have to punch them in and out to get them to work. At times the sound is distorted until the push button is exercised (a high resistance contact can actually act as a diode which causes this type of distortion. Another problem is at times the bass drops out (another switch contact?) on one or more speakers, I thought that it was a bad input connection to my amplifier (as I Bi-amp), but switching over to the S&IC that problem is gone.
I plan to add the variable Hall and Surround pot to my Photolume decoder when I'm done with the QSD-1. For the QSD-1 I'll check that the hall and surround blend is correct, replacing resistors or using a trim pot if necessary.