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Old 9th April 2006, 08:09 AM   #1
clem_o is offline clem_o  Philippines
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Default Aurex SB-150

Hi!

Anyone have info on this integrated amp? The only thing I can manage to get from the web is that Aurex is (was?) Toshiba's high-end line.

A friend gave me the unit, the left and right channels "drift", sounding horribly underbiased or clipped, then later ok, then later clipped again. I have not confirmed if the problem happens to both channels at the same time.

Any info / data appreciated...


Cheers!

Clem
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Old 9th April 2006, 03:39 PM   #2
anatech is offline anatech  Canada
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Hi Clem,
The information you got is correct. Aurex was Toshiba's higher end audio line.

Wait until you here distortion and look at the output with a 'scope. Measure the bias current with speakers disconnected.

I don't have a diagram, sorry.

-Chris
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Old 9th April 2006, 08:16 PM   #3
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Default !

I had once Toshiba Aurex A-50 amplifier.it's not powerfull amplifier,only 2*30W 8ohm!
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Old 10th April 2006, 12:34 AM   #4
clem_o is offline clem_o  Philippines
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Hi Chris,

Funny thing about it is it doesn't follow the usual crossover distortion sound pattern (i.e. as volume increases the distortion gets to be less audible). When it acts up, the distortion sounds about the same regardless of power level, leading me to think its more like an assymetric signal (thus some kind of saturation or cutoff problem). The output remains essentially DC-free though, the offset is around 4mV, pretty good!

Popped the lid off and gave it a cleaning. Its got a single-package diff-amp input and complementary outputs... promising but no exotic parts... I'll put a 'scope onto it sometime this week...

Cheers,

Clem
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Old 10th April 2006, 12:37 AM   #5
clem_o is offline clem_o  Philippines
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Default Re: !

Quote:
Originally posted by viktor1986
I had once Toshiba Aurex A-50 amplifier.it's not powerfull amplifier,only 2*30W 8ohm!

Hi Victor1986,

Yes, you're right, the trafo is very small; in fact the output transistors are TO-220, although the rails are +-35 volts. So I'd guess this SB-150 is rated even less, perhaps 20W/ch. If I manage to get it working I might use it in a small room, so I think the low power isn't an issue...

Cheers,

Clem
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Old 10th April 2006, 12:41 AM   #6
anatech is offline anatech  Canada
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Hi Clem,
Show me what a sine wave looks like.

Please?

-Chris
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Old 10th April 2006, 12:49 AM   #7
clem_o is offline clem_o  Philippines
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Default SB-150 - pics

Well, have a look at it, nice 1980s (?) integrated amp!

Cheers!
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Old 10th April 2006, 12:50 AM   #8
clem_o is offline clem_o  Philippines
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Hi Chris,

The sinewave you're going to see is going to look ugly. Tek uses an 8-bit ADC.

:-)

Clem

Innards of the amp...
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Old 10th April 2006, 01:27 AM   #9
anatech is offline anatech  Canada
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Hi Clem,
Bring on the nasty sine wave. It may have clues.

Man, I have fixed so many of those amps over the years. Whatever the model number is at the time, the amp stage remains the same.

Are you sure it's not in the preamp stage or a switch contact?

-Chris
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Old 10th April 2006, 02:10 AM   #10
clem_o is offline clem_o  Philippines
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Hi Chris,

Nothing eliminated yet, I agree that the problem could be in the preamp, was going to 'scope the line drive to the amp as well. The switches - seem to be ok. Only one is a bit flakey, that's the loudness.

I'll see if I can get to scope it tonight.. :-)

Cheers!


Clem
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