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Anyone got spec for AKAI AM-U02 amplifier?

mrGrosvenor

mrGrosvenor

vintage connoisseur...
Hello,

I wonder what the spec are for this AKAI AM-U02 amp...watts per channel?, years manufactured?

On the amps frontplate it says "dual power supply" I thought that it meant the amp would have dual powertransformers but inside its only one :scratch2: , quite big though...what does the "dual power supply" stand for ??

The amp has got de-dented tone controls,
Pre-Out / Main-In loop. etc, wonder if this amp was made with "high ambitions" in mind ...

My amp also got original rack handles.


regards Grosvenor :)
 
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bolly said:
sorry grosvenor, no orion bluebook listing for her
Click to expand...

:worried:
oh....
Im gonna try and post some pics of the amp in the coming days, maybe than someone recognize it.

:)
 
Okay,

Here are some pics of the amp, I just took...


akai107is.jpg


akai15b9gn.jpg


akai110ne.jpg


akai11ux.jpg



:)
 
Each channel has it's own rectifier, filter caps and probably winding on the transformer, hence dual power supply. I'm pretty sure I have an Akai (I haven't seen it for a while, I may be confusing it with an Hitachi) here somewhere that does have dual transformers, but it didn't get the dual power supply label.

Looking up the specs for the darlington power packs will give you an idea of the power output as it can't be anymore than the maximum rating of those devices.

I can't see it in the pic, but assuming it starts with STK the datasheet should be available online. In some cases the part number directly corresponds to it's rated output, for example an STK0050 will output 50W RMS in 8 ohms at 0.1% THD (according to the datasheet I have).
 
May help

mrGrosvenor, hello, this is my first time in Audiokarma.
This amp from Akai was manufactured between 1980 and 1982 aprox.
The output devices are STK type.
Power output is nearly 30 watta/ch.
I think it has 2 secondary windings in 1 transformer, one for each channel.

luck

walsn
 
walsn said:
mrGrosvenor, hello, this is my first time in Audiokarma.
This amp from Akai was manufactured between 1980 and 1982 aprox.
The output devices are STK type.
Power output is nearly 30 watta/ch.
I think it has 2 secondary windings in 1 transformer, one for each channel.

luck

walsn
Click to expand...


Hi,

Thanks for input :thmbsp: that information helped.

" melofelo how do these akais sound ? "

I have only used my amp together with a pair of AKG-240 headphopnes. I can´t comment on any specific sound characteristics, I think the sound is just "average" for amps of this kind.

regards Grosvenor :)
 
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i have one of these in black, but the right channel keeps clipping. i use headphones through an adaptor and both speakers on the left side on A and B.
 
I have an AM U04 which I rescured from the dumpster. It didn't do anything, then made an ugly noise through the speakers and then worked, but when I tried it again, nothing. I am interested in it even though it uses IC outputs, which I am not fond of, but it is a little more ambitious than the run of the mill integrated -- it has a midrange control and a two step variable loudness compensation.
I looked inside, and it has some fried resistors or diodes.
If anyone wants it, let me know. Its in ok shape cosmetically, but has some scratches.
 
I have an Akai integrated, AM-U4 if I recall correctly, might be slightly later than this, is 48wpc and is designed slightly differently. Pretty similar though it used discrete outputs sounded just fine IMHO, little warmer than I would have expected, especially with something with all that fancy stuff packed inside, VFDs and the like. I'd probably be using it if most of my systems weren't already in place when I got it, its a nice little amp.
 
I usually don't like the slide-type volume controls, but that Akai is a very nice-looking amp. The flourescent meters look sharp too. Cool!
 
I forgot to mention that the AM UO4 has the liquid flilled copper tube heat sink arrangement, which I believe gives the added pleasure of gurgling noises after it has been turned off.
TiMi: Will try to get some pictures, but like several other computer dolts here, I haven't yet figure out how to post them -- the files are too big. About postage -- its a pretty heavy object for its size. I suppose I could ask for a rough guess at the Post Office or UPS, if you are seriously interested, though I have to guess that postage would be more than its worth.
 
mrGrosvenor said:
Hello,

I wonder what the spec are for this AKAI AM-U02 amp...watts per channel?, years manufactured?

On the amps frontplate it says "dual power supply" I thought that it meant the amp would have dual powertransformers but inside its only one :scratch2: , quite big though...what does the "dual power supply" stand for ??

The amp has got de-dented tone controls,
Pre-Out / Main-In loop. etc, wonder if this amp was made with "high ambitions" in mind ...

My amp also got original rack handles.


regards Grosvenor :)
Click to expand...

I have the brochure.
AM-U02 , Rated Output Power : 2 X 26W RMS at 8 ohms (1kHz, THD 0.01%).
440mm (W) X 105mm (H) X 300mm (D). 7.8kg

AM-U03 : 2 X 37W RMS
AM-U04 : 2 X 50W RMS
AM-U06 : 2 X 72W RMS

Regards
 
Nat, i also thought up a new problem, do you have different mains voltages where you are? australia is 240vac. if there was cheap postage i could try to replace any visibly damaged diodes, fuses and resistors, even though it didnt work for my amp, and put in a new transformer(s) to change 240 v into the right secondary voltages.
 
TiMi
A quick look at postal rates suggests that it would cost $30 or more to send the AM U04 to Australia. I just don't think this makes economic sense, because I suspect its not the greatest amp in the history of the world, its a little rough around the edges, and needs repairs, even before you get into the voltage issue.
I took a look to see it it had variable voltage taps, but it does not. I suppose an adaptor might do it, but I can't believe there aren't equally interesting amps with fewer issues for relatively little money in Australia. So unless you are an Akai nut and they didn't sell this range in Australia, I don't think you want it.
Having said that,when I opened it up, I did notice that in addition to the liquid in a tube heat sink on the Sanken ICs, it had a large transformer, and dual power supplies, so some effort was taken in its construction.
If you still want it, I'll get a firm shipping price. And if anyone else closer wants it, and TiMi doesn't, give me a yell.
 
Idea?

Ive had a look and im thinking about building a pair of these, creating a box, and using the pre-outs on my AM-U02 to control it.
--> http://www.altronics.com.au/index.asp?area=item&id=K5185 <--
(go to altronics site and search 350w amp kit if the link dont work)
What does anyone else think? Will it work? I will try to get a dedicated preamp sooner or later, but that will probably end up being 10 years until that day. I am looking for an amp kit that says it has far more power than i really need after I lost faith in the watt with the invention of "Car Audio". I can probably get basic parts and the boards made up at school for free, so it may cost less than buying a kit. I think they are mono and the transformers are seperately purchased.
 
FX66 said:
I have the brochure.
AM-U02 , Rated Output Power : 2 X 26W RMS at 8 ohms (1kHz, THD 0.01%).
440mm (W) X 105mm (H) X 300mm (D). 7.8kg

AM-U03 : 2 X 37W RMS
AM-U04 : 2 X 50W RMS
AM-U06 : 2 X 72W RMS

Regards
Click to expand...
Hello FX66
I too have the AKAI AM-U02 vintage ! Could you plssss do me a big favour, since u say u have the brochure for the AM-U02, could you pls scan the doc and send it to me by email or post a photocopy to me, whichever is convenient to you since i do not have any documentation for this amplifier. I'd greatly appreciate any user manual / servicing manual / operating instructions brochure, etc... pertaining especially to the AM-U02.
 
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