I have always wondered what components and topologies the 1RU class D amps out of china use.
So I recently purchased a 1RU "clone" amp, 4 channel, both as a backup and as a loaner amp while repairing other amplifiers.
I promptly opened the box, and before even powering up, disassembled it.
This particular model is the new GaN Fet version. Claimed power is 3500w/8 ohms x4. I measured just over 3000w into 8 ohms sinewave, continuous, single channel driven. I suspect this power will fall as more channels are loaded.
The output channels each have 2 pairs of AOK033V120X2 GaNFETs (Alpha and Omega semiconductor), with series MBR60100PT Schottky diodes by "MHCHXM", and antiparallel BYC30W-600PT2 Hyperfast diodes by "We En"
The driver circuit was underneath the heatsink and I am yet to disassemble it to that level, however I did see many 74HC06 hex inverters, and and some other 74HC series chips.
Bad design elements are multiple through hole / surface mount electro's under and around the heatsink, which would experience higher heat levels.
I will post pictures soon.
-KAB
So I recently purchased a 1RU "clone" amp, 4 channel, both as a backup and as a loaner amp while repairing other amplifiers.
I promptly opened the box, and before even powering up, disassembled it.
This particular model is the new GaN Fet version. Claimed power is 3500w/8 ohms x4. I measured just over 3000w into 8 ohms sinewave, continuous, single channel driven. I suspect this power will fall as more channels are loaded.
The output channels each have 2 pairs of AOK033V120X2 GaNFETs (Alpha and Omega semiconductor), with series MBR60100PT Schottky diodes by "MHCHXM", and antiparallel BYC30W-600PT2 Hyperfast diodes by "We En"
The driver circuit was underneath the heatsink and I am yet to disassemble it to that level, however I did see many 74HC06 hex inverters, and and some other 74HC series chips.
Bad design elements are multiple through hole / surface mount electro's under and around the heatsink, which would experience higher heat levels.
I will post pictures soon.
-KAB
