Matchamp XTX 131 schematics
- Thread starter phelar
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analogguru
Well-known member
you shall not ask, you shall buy, therefore it is gooped - at least you get promised a relative input noise of -131,3 dB.... you don't need to know, how this dream-value (theoretical limit: -130,5dB) is achieved (probably with liquid helium) - simply believe it, buy it and tell it to your friends. 
IIRC the XTX131 was designed by Andy Gemmell-Smith and was sold as a balanced to single ended mic amp with low noise performance and high CMRR for about £30 per unit
Probably very similar to the earlier XTC129 with internal zener protection on the inputs. There is some more info in the Hugh Ford review of the 129 http://www.americanradiohistory.com/Archive-Studio-Sound/80s/Studio-Sound-1984-02.pdf
pp76-80.
I've never seen a schematic but it might be similar to the Alice Soundtech mixer front ends (for which I may have a schematic) which are std diff amps with feedback to the bases of a second pair of transistors
tc
Probably very similar to the earlier XTC129 with internal zener protection on the inputs. There is some more info in the Hugh Ford review of the 129 http://www.americanradiohistory.com/Archive-Studio-Sound/80s/Studio-Sound-1984-02.pdf
pp76-80.
I've never seen a schematic but it might be similar to the Alice Soundtech mixer front ends (for which I may have a schematic) which are std diff amps with feedback to the bases of a second pair of transistors
tc
