I have an Audio Innovations Alto amp (mk2 version - the version nobody loves). It was working when it was taken out of service and stored in my loft for several years. Documentation is impossible to find - no manuals or schematics.
I bought it pre-loved and with no manual and no remote. I did not even realize until today that the unit had remote capability - I thought it required pairing with the matching CD unit for this. Now I find the volume and mute functions work with my Marantz CD remote (though sadly not the input select). The input select (manual operation) operates the muting relay but not sure what else - the LED source indicators are ALL lit. Further testing required.
I have in mind to hack the unit, preserving the case ( for its looks) and preamp functionality (input select, remote volume) and remove power amp components.
The transformer is 24.6-0-24.6V 4A, producing +/- 35V.
I could -
a) keep the transformer & power supply circuit and fit a class D board (subject to space) - so far I have only found TDA8950 boards that suit the supply voltage. Would it be ok to attenuate the input to keep output power below what the transformer can supply?
Are there any other suitable class D boards to suit this supply?
b) forget fitting a power amp internally and rebuild as pre-amp only. I could fit a smaller power supply as I'd only need to service +/-15V & 5V circuits (I believe).
c) keep the case & controls, build entirely new pre-amp internals (arduino, relay based input select).
To say this is an interesting amp design (packaging-wise) is an understatement.
Anyone have any thoughts?
I bought it pre-loved and with no manual and no remote. I did not even realize until today that the unit had remote capability - I thought it required pairing with the matching CD unit for this. Now I find the volume and mute functions work with my Marantz CD remote (though sadly not the input select). The input select (manual operation) operates the muting relay but not sure what else - the LED source indicators are ALL lit. Further testing required.
I have in mind to hack the unit, preserving the case ( for its looks) and preamp functionality (input select, remote volume) and remove power amp components.
The transformer is 24.6-0-24.6V 4A, producing +/- 35V.
I could -
a) keep the transformer & power supply circuit and fit a class D board (subject to space) - so far I have only found TDA8950 boards that suit the supply voltage. Would it be ok to attenuate the input to keep output power below what the transformer can supply?
Are there any other suitable class D boards to suit this supply?
b) forget fitting a power amp internally and rebuild as pre-amp only. I could fit a smaller power supply as I'd only need to service +/-15V & 5V circuits (I believe).
c) keep the case & controls, build entirely new pre-amp internals (arduino, relay based input select).
To say this is an interesting amp design (packaging-wise) is an understatement.
Anyone have any thoughts?