So there's this Nikko Alpha II amp for $100 but the catch is that the entire right channel is out-meter and everything- yet the guy says the transformer for that side still hums along.
Main Question:
Is this a good deal to fix or a money pit?
Thanks!
pictures the person provided
Main Question:
Is this a good deal to fix or a money pit?
Thanks!
pictures the person provided
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I couldn't tell you if it's a money pit, but I sold a number of these back in the day as a stereo salesman and I remember that the sound quality was really a cut above. Just need to verify that there are no unobtanium parts etc in there. Maybe Sakis (east electronics)can chime in here.
Cheers
Cheers
The amplifier is excellent it will only need a recapping and it will serve you many years to come ...
IF outputs are blown are very easy to replace and other than that is a walk in the park to repair and play with...
It looks that the main caps have been replaced in the past there might be some issue or wiring fault
In any case you decide to go ahead you can have my support i have one the same lying around so i can verify a few things for you .
There is a small design flaw in this machine has to to with thermal stability and if you go ahead i will let you know ...
Kind regards
Sakis
IF outputs are blown are very easy to replace and other than that is a walk in the park to repair and play with...
It looks that the main caps have been replaced in the past there might be some issue or wiring fault
In any case you decide to go ahead you can have my support i have one the same lying around so i can verify a few things for you .
There is a small design flaw in this machine has to to with thermal stability and if you go ahead i will let you know ...
Kind regards
Sakis
An externally hosted image should be here but it was not working when we last tested it.
I'll get more pics up once I get home.
Guess this thread should be help me fix my Nikko amp now.
well opened it up and somebody's been father than the main capacitors like he claimed because 3 of the 4 board clips on the right channel are gone. Right channel fuse is blown as well. Transformer has weird coating that is not on the left side.
Starting to worry. Bridge rectifiers were replaced by the glue on the caps around them has been broken.
All these twisted wires around posts: should they be soldered?
A few of the right side amp board pins are bent.
those red and white twisted wires should not be there. Nothing burnt out though.
Any thoughts? I do have a bad feeling.
well opened it up and somebody's been father than the main capacitors like he claimed because 3 of the 4 board clips on the right channel are gone. Right channel fuse is blown as well. Transformer has weird coating that is not on the left side.
An externally hosted image should be here but it was not working when we last tested it.
Starting to worry. Bridge rectifiers were replaced by the glue on the caps around them has been broken.
All these twisted wires around posts: should they be soldered?
A few of the right side amp board pins are bent.
An externally hosted image should be here but it was not working when we last tested it.
those red and white twisted wires should not be there. Nothing burnt out though.
Any thoughts? I do have a bad feeling.
Congrats on the amp, you will be very happy with it once you get it up and running! The transistors you mentioned should be 2SB600 & 2SD555 I believe, I'll double check for you later when I get out to the shop. As far as the wires go, unless you have the correct wire wrap tool I suggest you solder to the posts. They are in fact wire wrapped from the factory but they use a special wire wrap tool that wraps them down to a specific torque and if you don't get them super tight they can cause major headaches, I have never had a problem soldering to posts.
The thermal paste is only an aid to heat transfer between the imperfectly flat, hard surfaces. It doesn't really conduct heat well and it doesn't insulate well electrically either, so all power transistors still need some form of insulating pad.
Thermal "paste" is used with a thin film or rigid insulating washer - mica, kapton etc. or special ceramic pads.
Silicone rubber or silpads and similar composite pads are soft and compliant so no grease is needed, nor should it be used.
Thermal "paste" is used with a thin film or rigid insulating washer - mica, kapton etc. or special ceramic pads.
Silicone rubber or silpads and similar composite pads are soft and compliant so no grease is needed, nor should it be used.
I was able to find a few pairs for sale about 6 months ago with out too much trouble, just keep searching the bay and amazon and some should turn up (I hope anyway!)
found q709 is dead. I am most likely going to replace all the transistors on the amp boards. NTE ones weren't that great anyhow I've heard.
I'm a little confused on this mod, should I do it?
An externally hosted image should be here but it was not working when we last tested it.
I'm a little confused on this mod, should I do it?
An externally hosted image should be here but it was not working when we last tested it.
bad sign...
Is it beneficial to replace the old diodes (1S2076) with 1N4148's?
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