Rotel RB-990BX Supply Voltage - diyAudio
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Old 20th August 2003, 10:22 PM   #1
tab30 is offline tab30  Germany
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Default Rotel RB-990BX Supply Voltage

Hello, I would like to buid this amp for my subwoofer.
I have The PCB and I think I can trust this amp.

anybody knows the Supply Voltage of this Amp ?
The PowerCAP's ratet 80 V but... ??

And why did I found such few from this amp in the forum.
For me it looks great.

The Driver Transitor's ( 2SA 1492 and 2SC3856 ) are verry expensive exist some ceaper I can use.

What do You mean ?

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Old 21st August 2003, 09:00 AM   #2
Konrad is offline Konrad  Norway
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Hi, in the upper right corner of ure pic, i think i t says 81v , remember it as somthing near 80v from a previus modifikation.
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Old 22nd August 2003, 12:15 AM   #3
tab30 is offline tab30  Germany
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Default Not The Voltage

This means +B1 and on the neagitve rail -B3
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Old 22nd August 2003, 05:16 AM   #4
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Default Full schematic

Hi Andi ,
Could you please post the full schematic. I can see only a strip of it.

I am sure you can use other power devices.
An 80 volt cap means that the supply must be at least 20% lower than this . Could be in the 60 + volt range.How many watts is it per channel ?
How about the full ckt diagram?
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Old 22nd August 2003, 03:09 PM   #5
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I found a schematic for the RB-991 power amplifier on the internet yesterday.
The RB-991 also uses 2SA1492 and 2SC3856 for the Driver Transitor's.

On the schematic for the RB-991 it says 73V.

If you would like to see the schematic for the RB-991 it can be found at
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