RA 600 Power amplifier

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I have a customer that is powering their sound system with an old Rickenbacker RA-600 Power Amplifier. all it says in the back of the amp is 475W. does anyone know the power rating at 8 ohms per channel in stereo mode and other specifications. The amp is so old no one at Rickenbacker knows anything about it.
 
Found some comments on German eBay (Google translated):

Rickenbacker RA 600 high-end power amp
- Manufactured by Sony, High End Quality
- 19 "housing
- Very solid manufactured
- difficult !!!
- Power: 2x 300 watts into 4 ohms
- Bridged mono operation possible
- Inputs are XLR and jack 6,3, on request I put to RCA adapters in
- Very rare device
- Rasterized potentiometer
- Solid LS terminals
- No fan!
- Works naturally .o)
- LED power indicator
- Optical traces of use, see pictures, nothing serious
 
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