chip amp recommendation please

[AudioSan]

Is this 76Vdc at the PSU? or 76Vac at the transformer secondary?
I suspect it's 76Vdc at the PSU output.

 

[Jennifer G]

Is this 76Vdc at the PSU? or 76Vac at the transformer secondary?
I suspect it's 76Vdc at the PSU output.

I measured the AC at the input leads to the DC PSU board from the transformer, just before the rectifier.

 

[AudioSan]

Wow. then it's way to high voltage. Also much higher then expected from a 60W@8ohm amp. 2x38Vac is good for around 150W@8ohm.

 

[Jennifer G]

Nelson Pass designed it

 

[infinia]

changing out the innards of a working GFA535 for a chipamp.com design would be a major downgrade.

 

[AudioSan]

i did check this out. and it is in fact 70V CT transformers. so you can not use those.

 

[Jennifer G]

changing out the innards of a working GFA535 for a chipamp.com design would be a major downgrade.

yeah i'm not gonna do it A used gfa535 only goes for $70 or so on ebay though.. metal case and heat sinks cost that much or more. But I don't wanna ruin this amp. I probably would of done it if I could of gotten away using those transformers in it.

THe GFA 535 isn't clean enough for me. The $150 behringer (which blew in both channels) sounded much clearer / better .. especially in the highs. I have to turn up the digital EQ on iTunes to get the 535 sounding right. SO this is why I am going to try the chip amp.

 

[Jennifer G]

i did check this out. and it is in fact 70V CT transformers. so you can not use those.

Thank you.

 

[Jennifer G]

i just bought the antek 300va 25v+25v transformer for $41.

 

[infinia]

yeah i'm not gonna do it A used gfa535 only goes for $70 or so on ebay though.. metal case and heat sinks cost that much or more. But I don't wanna ruin this amp. I probably would of done it if I could of gotten away using those transformers in it.

THe GFA 535 isn't clean enough for me. The $150 behringer (which blew in both channels) sounded much clearer / better .. especially in the highs. I have to turn up the digital EQ on iTunes to get the 535 sounding right. SO this is why I am going to try the chip amp.

I use mine everyday for my PC monitor setup. ive compared against bigger amps it's less noise no hum so cant complain.
BTW The little Behringer 2way active speakers use 3X LM3886 inside

 

[Mircea Crisan]

LM3886

You can try my PCB, but it wasn't tested.
Keep up the good wotk!

Regards,

Mircea.