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SX-1250's tuner section is comparable to which separate tuner?
- Thread starter steveUK
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Being a TOTL product, the SX-1250 used the same FM front end as the other TOTL Pioneer receivers and separate tuners from that period such as the SX-1010, SX-1980, TX-9100, TX-9500, TX-9500II and TX-9800. Some of the separate tuner models had additional features such as selectable IF bandwidth, SAW filters, selectable muting threshold, multiplex noise filters as well as quartz lock tuning in the SX-1980. In terms of performance, the SX-1250 compares quite closely to the TX-9500.
Les.
Les.
steveUK
Active Member
Thanks Les. Well that's good news then cos the TX-9500 reviews quite nicely in fm tuner info: http://www.fmtunerinfo.com/pioneer.html
I though that they should have had a MPX noise filter on the 1050/1250 like they did in the 950/850. The cost of a switch and a cap 
make you wonder. Also these days with the crowded FM band, a narrow IF filter would have been good as well. Sansui used IF BW selection in the G-9000 and others.
You could mod the multi-path switch for a different function.
I could suggest a few upgrades to the 1250 tuner, you could replace the older Hitachi stereo decoder HA1196 with a higher performance one like the HA11225.
make you wonder. Also these days with the crowded FM band, a narrow IF filter would have been good as well. Sansui used IF BW selection in the G-9000 and others.You could mod the multi-path switch for a different function.
I could suggest a few upgrades to the 1250 tuner, you could replace the older Hitachi stereo decoder HA1196 with a higher performance one like the HA11225.
steveUK
Active Member
I though that they should have had a MPX noise filter on the 1050/1250 like they did in the 950/850. The cost of a switch and a cap
You could mod the multi-path switch for a different function.
I could suggest a few upgrades to the 1250 tuner, you could replace the older Hitachi stereo decoder HA1196 with a higher performance one like the HA11225.
Would the HA11225 literally be a drop in replacement? Like, solder it in and you're away? If not what in total would need to be done? And in what way would it improve performance?
steveUK
Active Member
Thanks. Well, if it doesn't just drop in, and without further guidance it's beyond my capability.
steveUK
Active Member
Sounds great! well, if you - or anyone - ever does it, I'd definitely like to get the details. Thanks.
Apart from making a pcb for the HA11223, you could wire one up on a proto board, just need to follow the data sheet exactly.HA11223 is used on many high end tuners, such as the famous Sansui TU-X1, so there are lots of schematic examples to follow. Basically replace the existing HA1196 mpx IC with a IC socket and use a component adapter/header to run the signals to the HA11223 pcb. Use the existing LPF on the 1250.
