Good day ! I hope that someone here in the forum has information about the adjustment of the Parasound PLD 2000 preamplifier. In the late 90's I did warranty repairs here in Germany for a company I didn't know at the time called “Parasound”. In case of major problems I could call Tony Points from the service center at Parasound and by working together I was able to repair every device. Unfortunately, I no longer have any contact with Parasound. I have also written to John Curl here in the forum. But I don't know how he is doing and if he is still active here in the forum.
I already repaired my Parasound PLD 2000 . At first I feared a fault in the "magic 4-quadrant differential amplifier". But it was a simple 10 Ohm resistor ( R073 10 Ohm ) in the power supply limiting the current on the +30 volt line that was open . ( Possibly the resistor also forms an RC low pass with the following
capacitors.) Unfortunately I only have the circuit diagram and no adjustment instructions. Important would be the quiescent current in the output stage which is measured via two 0.47 Ohm resistors. There are even adjustment points for the quiescent current on the circuit board.
Thank you very much !
Best regards from the Odenwald
Stefan Winter
I already repaired my Parasound PLD 2000 . At first I feared a fault in the "magic 4-quadrant differential amplifier". But it was a simple 10 Ohm resistor ( R073 10 Ohm ) in the power supply limiting the current on the +30 volt line that was open . ( Possibly the resistor also forms an RC low pass with the following
capacitors.) Unfortunately I only have the circuit diagram and no adjustment instructions. Important would be the quiescent current in the output stage which is measured via two 0.47 Ohm resistors. There are even adjustment points for the quiescent current on the circuit board.
Thank you very much !
Best regards from the Odenwald
Stefan Winter