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Old 14th January 2004, 03:48 PM   #1
vazzy is offline vazzy  Australia
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Default Sonab amplifier information?

Hi,

Does anyone know anything about Sonab amplifiers ?
I would like to know the specs for the P4000 model, but any general information would also be good.


Thanks in advance.
Vas.
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Old 15th January 2004, 12:50 PM   #2
vazzy is offline vazzy  Australia
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Hi again,

I found some schematics for the amp, however not being a pro means i cant really get a gut feelin for the design...

The link for the schematics is
url]http://www.arky.ru/audio/shem/sb4000.zip[/url]

What do people think about this amp ??


Thanks,
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Old 15th January 2004, 01:10 PM   #3
Electrons are yellow and more is better!
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Aaah, swedish history! It looked cool but the inside is the 70's I'll guess. 2N3055 in the output stage...
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Old 15th January 2004, 02:08 PM   #4
vazzy is offline vazzy  Australia
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Hi peranders,

Thanks for your reply.

Im thinking this amp should deliver around 50wpc ? What do you think about replacing the 2N3055 in the output stage with something like MJ15003/15004. Would that provide much improvement in sound ? Do you think it would require adjustments if this was done ?

I've looked and looked, but there seems to be very little information around...

Thanks again
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Old 15th January 2004, 02:50 PM   #5
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I think Sonab was just a local swedish brand back in the 70's.
I didn't even remember them making amps. They were mainly
known for their speakers, but there were a lot of swedish
brands of speakers, very few of which were known outside
Sweden I guess. Maybe some of the other swedes on the
forum knows something more about the amp, but I doubt
it had much of a reputation even here.
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Old 15th January 2004, 04:06 PM   #6
Electrons are yellow and more is better!
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Sonab had a good reputation for both loudspeakers, amp and turntables. The amps had a beautiful design, in black and with nice looking meters.
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Old 24th January 2004, 10:41 PM   #7
bandit is offline bandit  Sweden
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from 1977
Attached Images
File Type: jpg 4000.jpg (63.1 KB, 1195 views)
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Old 25th January 2004, 04:14 AM   #8
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I happen to have a Sonab 4000R-2/S, the one to the right in the picture Bandit added.

I found a schematic inside my receiver, it was taped under the cover.

The ouput transistors are some strange Motorola 7320001 in TO3 "cans" and marked as well in my schematic 7320001...
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Old 25th January 2004, 03:34 PM   #9
vazzy is offline vazzy  Australia
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Hi,

thanks for the info!

I think that the p4000 and the r4000 are somewhat different. My p4000 definately uses a 2n3055 and a Motorolla for the pnp. The apperance is also a little different as it doesnt have the dials next to the selector switch (it has mic in, and headphone out). However apart from that the amps look identical.

I got the amp with the left channel blown. So im trying to decide whether i should try to fix the amp, try to refund it or whether to try to put something else into the case. While im at it, would anyone know what the problem in the left channel could be?

Cheers,
Vas.
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Old 25th January 2004, 10:07 PM   #10
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Quote:
Originally posted by vazzy
The apperance is also a little different as it doesnt have the dials next to the selector switch (it has mic in, and headphone out). However apart from that the amps look identical. Vas.
The dial is for the FM tuner. Because Australia didn't have FM back then, the Australian version of the amp omitted it and replaced it with the mic and headphone sockets.

Glenn
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