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A good question...
There was a RS90 reciever from SABA in the 80's. It was a simple set, perhaps comparable to the Dual CR 1020. But not made anymore by SABA, it came already completely from asia.
Unfortunately i don't own a manual and there isn't one in the download area... perhaps you can get one on ebay, look here:
http://www.ebay.de/itm/Saba-Original-Service-Manual-Receiver-RS-90-/250461561266
But did i get you right - there isn't a transformer in your set? Did anyone try to repair it already? So by chances there is a lot more to repair. Anyway it will not be so easy to get the right transformer for the set. The values (voltage and current) have to be correct...
Can you describe what's missing - probably post a picture?Gruß, Gunnar -
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Up to now i still have no idea how to get the correct transformer for your RS90 without a service manual.
The inside looks like any typical Sony, Technics,... unit from the 80's, but we don't know by now if there has to be one balanced voltage or 2 coming from the transformer.
Perhaps you can buy a service manual, but this depends on the value the reciever represents for you. A transformer with about 120-150 watts (i don't think it will have to supply more power) will cost about 30 - 50 euros, depending on the neccessary voltages it has to deliver.
Now it's up to you to decide how much you like to invest in the reciever...Gruß, Gunnar -
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Can you please post the Number of the STK....
With that (and it's datasheet) we can look after the most likely voltage for the final stage, i would guess it must be about +/- 30 volt DC, no more. So in AC you will have about 2 x 22 volts. And for the current; will not be more than 3 amp.
But the second balanced voltage... don't know. That will be the power supply for the whole pre-stages, tuner etc. Normally you have about +/- 15 volts for this in classic circuit design. So for this 15-18 volts AC will be sufficient, and no high current, maybe about 1 amp.
Hope this helps in first place to look for a transformer (at least to check the price). In any case it will be better to have all the values from the service manual.Gruß, Gunnar -
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If the amp is the 4141, the voltage for the nominal power of the RS 90 will be about +/- 35 volts, so the transformer has to supply about 2 x 25 V at 3 A for that.
For the other power supply i still don't know, but most likely it will be about 2 x 15 V, so leads to about 22 V before the regulation.
Perhaps you can get a transformer with the needed values, but the risk still is, that it will not work proper. I'll try and ask someone if there is a service manual.Gruß, Gunnar -
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Unfortunately up to now i didn't have success in getting a service-manual, sorry.
And you are right, the 920 seems to be a successor of the 90 reciever. The problem still is here, no service manual. The manuals in the download-area (910 / 930) give no clue, because the main amplifier in these sets is built discrete, so i don't think the voltages from the power-supply are comparable.
But if only 2 different balanced supplies are needed, the best guess ist still 2 x 22-25 V (rated 3 Amp) and 2 x 15 - 18 V (perhaps rated 1 Amp). If you have transformer(s) with such voltages, why don't you give it a try?Gruß, Gunnar -
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Hi,
there is quite a difference between the 9903 and 9940/41. The 9903 is a more simple model, it has nearly the same power-amp, but the following differences:
- 9903 "only" has a belt-drive turntable instead a direct drive
- the cassette-deck is more simple in 9903 (in 9940 it's a logic deck with 2 motors)
- the tuner in 9903 has mechanical presets and in 9940/41 you find electronic presets.
But apart from that the 9903 is a good stereo-set too. The tuner has a high sensitivity and sounds good, the power-amp sounds warm and powerful and the turntable is ok too.
If you can get your hands on one of these and have space to place them, grab it!
I own a 9940 and it's a fine thing! I like it...Gruß, Gunnar
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