Alright!.. was commissioned a project on an Aiwa P 30 Power amp.The owner had shorted the output terminals of course by mistake and one of the STK 0050s blew up.
Yes the amp was upgraded from a 0040 to a 0050 by the previous owner.The amp was purchased by the current owner from an audio dealer along with its sweet sounding matching Preamp.
Anyway for those of you who don't know this amp...This was ones of Aiwa's flagship micro series..came with a tuner,preamp,and cassette deck,probably even a timer.But this was no ordinary mini component set.The power amp has a toroidal transformer with two heat sinks running the full side length of the amp.The STKs it uses are mono ones to avoid cross talk and even the power amp modules are two different pcbs vertically mounted to save space.
The rectifier section has Nippon's 40v 10000 uf caps loaded so should give good amount of punch with a good pre.
Anyway here are the specs that is with the original STK 0040 plugged in.
Anyway we tried to source the STK...actually the owner tried his best to source one with his contacts.He did get a few but most of them were either used that were pulled out from a scrap amp or the rest were Chinese replicas.
If it was any other guy I would have told to scrap the amp cause even though it was rare it was not worth it to repair it cause it was a gamble.The STKs were gonna be sourced from Honk Kong but it is possible they could arrive dead on arrival.That was not the only point over the years the PCB itself got warped and thus many of the tracks were cracking.
But this guy loved the amp so I offered him another route to fit an audiophile diy amp module inside and hard wire it to the power supply and the other various outputs it needed and keep it as original as possible.
So he was OK with that cause at least the amp would run trouble free for the next 6 to 7 years
The only problem was the amp was too small to fit in the regular kits:sad:
But then I found the LM3886 would just fit the bill.The Supply voltages were directly in the required zone and the ic is a well know one with really good specs.
With the amps original power supply i can easily pull out raw 55w with 8ohm load and 0.03THD and 96db S/N ratio which is pretty impressive.
So this thread is about the restoration/modification of this amp and hoping to bring this vintage beauty back to life.Updates will be posted timely when progress is done.Even I'm excited about what will be the turnout of this amp and hopefully it should sound as good as or better than the original modules.
Pics will be posted later I assure you cause it is really boring with pics lats face it
hyeah:
Thanks,
Ethan.
Yes the amp was upgraded from a 0040 to a 0050 by the previous owner.The amp was purchased by the current owner from an audio dealer along with its sweet sounding matching Preamp.
Anyway for those of you who don't know this amp...This was ones of Aiwa's flagship micro series..came with a tuner,preamp,and cassette deck,probably even a timer.But this was no ordinary mini component set.The power amp has a toroidal transformer with two heat sinks running the full side length of the amp.The STKs it uses are mono ones to avoid cross talk and even the power amp modules are two different pcbs vertically mounted to save space.
The rectifier section has Nippon's 40v 10000 uf caps loaded so should give good amount of punch with a good pre.
Anyway here are the specs that is with the original STK 0040 plugged in.
Anyway we tried to source the STK...actually the owner tried his best to source one with his contacts.He did get a few but most of them were either used that were pulled out from a scrap amp or the rest were Chinese replicas.
If it was any other guy I would have told to scrap the amp cause even though it was rare it was not worth it to repair it cause it was a gamble.The STKs were gonna be sourced from Honk Kong but it is possible they could arrive dead on arrival.That was not the only point over the years the PCB itself got warped and thus many of the tracks were cracking.
But this guy loved the amp so I offered him another route to fit an audiophile diy amp module inside and hard wire it to the power supply and the other various outputs it needed and keep it as original as possible.
So he was OK with that cause at least the amp would run trouble free for the next 6 to 7 years
The only problem was the amp was too small to fit in the regular kits:sad:
But then I found the LM3886 would just fit the bill.The Supply voltages were directly in the required zone and the ic is a well know one with really good specs.
With the amps original power supply i can easily pull out raw 55w with 8ohm load and 0.03THD and 96db S/N ratio which is pretty impressive.
So this thread is about the restoration/modification of this amp and hoping to bring this vintage beauty back to life.Updates will be posted timely when progress is done.Even I'm excited about what will be the turnout of this amp and hopefully it should sound as good as or better than the original modules.
Pics will be posted later I assure you cause it is really boring with pics lats face it
hyeah:Thanks,
Ethan.
