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Nikko alpha iii power stereo amplifier how to#

it keeps playing music for maybe 10 seconds, WHICH SOUNDS MOSTLY FINE. Interestingly, when I turn the amplifier off. I've tried this with two different sources, speakers, speaker wires. In particular, the midrange and lows mostly sound fine but the treble is severely clipped and warbled. Now, I've turned it on, and hooked it up to my speakers, and it produces music. But the most recent repairs were the power cap replacements and fixing the capacitor on the protection circuit board. (I should note that the amplifier boards are made of a different, higher quality material and seem to be doing just fine)Įvery fix I've done has usually resulted in me gacking something else up, so the state of the amp has been between one channel muted to the other channel muted to functional (at one point it worked but when I put the chassis back together, a bare wire shorted a one channel and the cap on the protection circuit's PCB trace came loose).

Replaced one capacitor on the protection circuit using jumpers, since it seems to be degrading in the same way as the transistor PCBs.

The originals were 10,000 uF/63V, the new ones are 22,000 uF/63V.

Replaced the 4 power capacitors with caps of the same voltage rating and SIZE, rather than capacitance, to make mounting the new ones into the chassis as easy as possible.

Replaced all of the wiring on the main transistors (the ones attached to the heatsink) with jumpers, since the circuit boards they were mounted to were degrading and losing their connection (hence the scratchy left channel).

The protection circuit, the only other board in the amplifier, had already been serviced when I got it.

Replaced all capacitors on the power supply board and amplifier boards.

Keep in mind that I have no formal education regarding electronics, and my knowledge of circuits is very, uh, rudimentary.

Nikko alpha iii power stereo amplifier how to#

I figured it would be a great project to learn how to fix up an amplifier. Long story short, a friend of mine gave me a Nikko Alpha II power amplifier that had a scratchy right channel. No posts on products or items that are not diy relatedīuying or Selling of equipment goes to /r/avexchangeįull Rule list here Check out our sister subs /r/diytubes for vacuum tubes and /r/headphonemods for headphone DIY! r/synthDIY for all your DIY robot tone needs r/vinylpro and /r/vinyl for turntables and shellac spinnery r/budgetaudiophile Affordable stuff you can't build

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