billyz
Super Member
Just for fun I recently purchased the Sansui QS500 quad synthesizer , rear channel amplifier.
I know its not the greatest quad synthesizer , but it is very enjoyable none the less and I got it for $90 plus shipping. I am not using the manual setup procedure. I have a tube preamp with an output splitter jack going straight to the main tube power amp for the fronts ( klipsch Cornwall ) and the other output going in to the Sansui to drive the rears.
Seems to be working well and the qs500 is driving a set of Klipsch Forte II's . Pretty efficient speakers and the sansui does just fine and sounds very good. I have tried various settings on the quad selector and currently have it on Hall setting 1 or 2. It really adds a lot of depth without mucking up anything.
I did find a procedure for setting the bias to 15-20ma per channel. I found it took quite a while for the settings to stabilize and if I blew on the output transistors it would change quite a bit. Initially I measure over 60ma on one side and 40ma on the other. I am still running all the original caps . I did notice that after having used it a bit it seems to be sounding better. I guess the caps having reformed sufficiently. I may recap it in the future. I recently recapped an AU7500 and only the mains filters were leaking.
To close, I highly recommend the Sansui QS 500 if you are at all curious about Quad.
The Sansui QRX3500 I am using upstairs with Sansui SP200 fronts and SP2500's rear has a much better quad processor ( separation ) and really sounds great ! I know the later models have even better quad processors.
billy z
I know its not the greatest quad synthesizer , but it is very enjoyable none the less and I got it for $90 plus shipping. I am not using the manual setup procedure. I have a tube preamp with an output splitter jack going straight to the main tube power amp for the fronts ( klipsch Cornwall ) and the other output going in to the Sansui to drive the rears.
Seems to be working well and the qs500 is driving a set of Klipsch Forte II's . Pretty efficient speakers and the sansui does just fine and sounds very good. I have tried various settings on the quad selector and currently have it on Hall setting 1 or 2. It really adds a lot of depth without mucking up anything.
I did find a procedure for setting the bias to 15-20ma per channel. I found it took quite a while for the settings to stabilize and if I blew on the output transistors it would change quite a bit. Initially I measure over 60ma on one side and 40ma on the other. I am still running all the original caps . I did notice that after having used it a bit it seems to be sounding better. I guess the caps having reformed sufficiently. I may recap it in the future. I recently recapped an AU7500 and only the mains filters were leaking.
To close, I highly recommend the Sansui QS 500 if you are at all curious about Quad.
The Sansui QRX3500 I am using upstairs with Sansui SP200 fronts and SP2500's rear has a much better quad processor ( separation ) and really sounds great ! I know the later models have even better quad processors.
billy z