Ex-MTB Posted May 12, 2020 Share Posted May 12, 2020 (edited) Item: Pioneer TX-950II Price Range: $200-$300 Item Condition: Used Extra Info: Probably a long shot... I used to have a TX-7500 which I quite liked, so would like a 9500 II for myself. Just putting it out there in case anyone has one floating around. Looking for one in nice condition (unscratched face plate etc). Thanks Edited October 29, 2020 by Ex-MTB Link to comment Share on other sites More sharing options...
Ian McP Posted May 12, 2020 Share Posted May 12, 2020 nice tuner, I sold a TX7500 to a mate a few years back https://www.fmtunerinfo.com/pioneer.html < Pioneer TX-7500 (1976, $250, photo) search eBay This little brother of the TX-9500 is a good tuner in its own right, according to our contributor Bill Ammons. The 4-gang TX-7500 has a similar front end to that of the TX-8500II. The TX-7500's single-bandwidth IF stage consists of 3 ceramic filters and one gain stage. The FM quad chip is an HA1137 which is followed by an HA1156 stereo demod chip. The audio output is discrete. The AM section uses an HA1138 chip. Bill adds, "The higher Q design of the RF front end allows better operation in strong signal environments. The construction of the unit makes it very easy to service and modify. The TX-7500 and TX-8500II have many similar parts. I modified the TX-7500 with two IF FILTER ADDER PCB (TM) boards. This brought the IF ceramic filter count up to 5, and added two gain stages for a total of 3. When modified, the TX-7500 is just as sensitive as a TX-8500II." The TX-7500's back pamel includes fixed and variable audio outputs, multipath outputs for a oscilloscope, and a switch to change the de-emphasis. The TX-7500 is very common on eBay; almost any sale price is possible up to $100, but most sell for $40-60. > < Pioneer TX-9500II (1977, $400, front, back, inside, with amp, ad 1, ad 2, brochure) search eBay The TX-9500II has 5 gangs and a very unusual configuration of filters: an LC filter and an SAW (surface acoustic wave) filter for the wide IF bandwidth mode and 5 normal 3-pin ceramic filters for narrow mode. The wide/narrow switch and filter configuration distinguish it from its virtually identical predecessor, the TX-9500. Our contributor David Rich describes what's inside: "Same front end as TX-9100. In the IF the main signal path has an 8-pole LC filter followed by a SAW filter. The narrow path has 5 ceramic filters. Both IF paths go through 5 stages of bandpass limiting similar to the TX-9500, but a pair of multiple-section LA1222 chips are used instead of the five single-stage limiter chips in the TX-9500. The TX-9500II's FM detector is the same M5109PR chip used in the TX-9500. The MPX chip is a PA1001. The MPX outputs are buffered by a PA1002 which appears to be a Pioneer quad op-amp with some extra function that is not clear from the schematic. A PA3001 chip replaces the HA1137 for the meter drive. In the SX-1980 receiver that goes for really really big bucks on eBay, there is a PA3001 in the main signal path. The PA1001 and PA1002 based MPX stage of the SX-1980 are the same as in this tuner. The big difference is that the TX-9500II has the big LC filter, the SAW filter, the five stages of narrow-band limiting, and that strange M5109PR FM decoder." > see more at https://www.fmtunerinfo.com/pioneer.html there's a review page 68 of May 1977 issue of Audio, download pdf here https://www.americanradiohistory.com/Archive-All-Audio/Audio-Magazine.htm regards Ian Link to comment Share on other sites More sharing options...
Ex-MTB Posted May 12, 2020 Author Share Posted May 12, 2020 24 minutes ago, Ian McP said: nice tuner, I sold a TX7500 to a mate a few years back https://www.fmtunerinfo.com/pioneer.html < Pioneer TX-7500 (1976, $250, photo) search eBay This little brother of the TX-9500 is a good tuner in its own right, according to our contributor Bill Ammons. The 4-gang TX-7500 has a similar front end to that of the TX-8500II. The TX-7500's single-bandwidth IF stage consists of 3 ceramic filters and one gain stage. The FM quad chip is an HA1137 which is followed by an HA1156 stereo demod chip. The audio output is discrete. The AM section uses an HA1138 chip. Bill adds, "The higher Q design of the RF front end allows better operation in strong signal environments. The construction of the unit makes it very easy to service and modify. The TX-7500 and TX-8500II have many similar parts. I modified the TX-7500 with two IF FILTER ADDER PCB (TM) boards. This brought the IF ceramic filter count up to 5, and added two gain stages for a total of 3. When modified, the TX-7500 is just as sensitive as a TX-8500II." The TX-7500's back pamel includes fixed and variable audio outputs, multipath outputs for a oscilloscope, and a switch to change the de-emphasis. The TX-7500 is very common on eBay; almost any sale price is possible up to $100, but most sell for $40-60. > < Pioneer TX-9500II (1977, $400, front, back, inside, with amp, ad 1, ad 2, brochure) search eBay The TX-9500II has 5 gangs and a very unusual configuration of filters: an LC filter and an SAW (surface acoustic wave) filter for the wide IF bandwidth mode and 5 normal 3-pin ceramic filters for narrow mode. The wide/narrow switch and filter configuration distinguish it from its virtually identical predecessor, the TX-9500. Our contributor David Rich describes what's inside: "Same front end as TX-9100. In the IF the main signal path has an 8-pole LC filter followed by a SAW filter. The narrow path has 5 ceramic filters. Both IF paths go through 5 stages of bandpass limiting similar to the TX-9500, but a pair of multiple-section LA1222 chips are used instead of the five single-stage limiter chips in the TX-9500. The TX-9500II's FM detector is the same M5109PR chip used in the TX-9500. The MPX chip is a PA1001. The MPX outputs are buffered by a PA1002 which appears to be a Pioneer quad op-amp with some extra function that is not clear from the schematic. A PA3001 chip replaces the HA1137 for the meter drive. In the SX-1980 receiver that goes for really really big bucks on eBay, there is a PA3001 in the main signal path. The PA1001 and PA1002 based MPX stage of the SX-1980 are the same as in this tuner. The big difference is that the TX-9500II has the big LC filter, the SAW filter, the five stages of narrow-band limiting, and that strange M5109PR FM decoder." > see more at https://www.fmtunerinfo.com/pioneer.html there's a review page 68 of May 1977 issue of Audio, download pdf here https://www.americanradiohistory.com/Archive-All-Audio/Audio-Magazine.htm regards Ian Wow, what a great resource that is, thanks for the link. Yes, am listening to the TX-7500 as we speak, very nice unit. Link to comment Share on other sites More sharing options...
Ian McP Posted May 12, 2020 Share Posted May 12, 2020 see my PM to you re; tuner Link to comment Share on other sites More sharing options...
Ex-MTB Posted May 19, 2020 Author Share Posted May 19, 2020 Still looking! Link to comment Share on other sites More sharing options...
Ex-MTB Posted May 26, 2020 Author Share Posted May 26, 2020 Bump... Link to comment Share on other sites More sharing options...
Ex-MTB Posted September 3, 2020 Author Share Posted September 3, 2020 Bumping this - I'm still looking. Have had a kind offer for a mk 1, but I really have my heart set on a 9500 II. Pretty please, hifi gods? Link to comment Share on other sites More sharing options...
Blue Ruin Posted February 14, 2021 Share Posted February 14, 2021 You still looking? Link to comment Share on other sites More sharing options...
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