From Prowla:
I just noted the above link and whilst idly drifting through the products, I remembered a previous life 'hot rodding' Quads. The pre-amps were blighted by one particular design quirk - switching of signals is carried out by cmos integrated circuits. These 4066 quad bilateral switches were designed for use in the Plessey 'System X' Telephone Exchanges. They were never intended to be used in equipment with a wide dynamic range and consequently, literally strangle everything trying to pass through them. We had to go to inordinate lengths to replace the 4066 cmos switches by some sealed reed relays which is in my opinion, well beyond the scope of DIY.
Bottom line: Don't waste your time and effort.
Agreed. The Quad amps have the unique capability of making any connected loudspeaker sound as if it's face down on the carpet. They don't do anything wrong, it's just that they don't do anything right either (such as stirring the blood for instance).No - it's like listening to music with cotton wool stuffed in your ears.
I just noted the above link and whilst idly drifting through the products, I remembered a previous life 'hot rodding' Quads. The pre-amps were blighted by one particular design quirk - switching of signals is carried out by cmos integrated circuits. These 4066 quad bilateral switches were designed for use in the Plessey 'System X' Telephone Exchanges. They were never intended to be used in equipment with a wide dynamic range and consequently, literally strangle everything trying to pass through them. We had to go to inordinate lengths to replace the 4066 cmos switches by some sealed reed relays which is in my opinion, well beyond the scope of DIY.
Bottom line: Don't waste your time and effort.