Posted by Ken on February 01, 2004 at 18:53:47:
In Reply to: Re: QRX 5500A / QRX5500 posted by Sten on January 29, 2004 at 00:45:21:
It seems the same for my 5500A. I have two boards.
A 2048 called a Vario-Matrix in my Manual
A 2084 called a QS Vario-Matrix with two chips.
IC601 = HD3103PB and
IC602 = HA1327 (L,N)
So the 7500A and 5500A are identical as far as the QS circuitry.
Thanks again, I was looking at a 5500 on Ebay as a spare parts machine. Looks like I might want to stick to the 5500A version
: Hi Ken
: "QuadBob", the guy who knows everything about Sansui 4-Channel gave this answer for QRX-7500/7500A and it might be the same for QRX-5500/5500A. See below:
: The only real difference is that the 7500A was a "hybrid" unit as Sansui transitioned from their discrete component vario-matrix decoder pcbs to their custom designed Vario-matrix ICs that were used in the QRX-7001/8001/9001. There were two distinct ICs they made.....one was the "decoder" IC and the other a "control" IC which enhanced the separation and decoding ability. The QRX-7500A has the decoder IC but not the control IC. The later receivers had both.
: So, the decoder pcbs in the QRX-7500 are the 2047 and 2048 pcbs. The QRX-7500A substituted a 2084 pcb with the decoder ICs on it for the 2048 pcb. Also, in conjunction with this upgrade Sansui changed the labeling on the function select switch from the "QS decoder" and "QS synthesizer" selections to the later "QS", "SQ", and "Surround" selections.
: The QRX- *001 series receivers used completely redesigned decoder pcbs (2087 and 2088) utilizing both of the Vario-matrix ICs.
: : Anyone know the big difference between the QRX5500A and the QRX5500?
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