I've looked at the specs for the Yamaha DSP-A5 and from what I can see, it has no built in phono stage.  You would need a phono stage to connect the RX2 to the Yamaha amp. To test the turntable, I would suggest you just get a cheap RCA to DIN adapter from eBay (I bought

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Thank you for your reply my friend, I will try that. I have another issue now and for some reason the arm doesn't want to track the LP, I must have done something trying to set the weight on the arm? I have another Deck Philips R12, which does work through the phono RCA input on my AMP! Confused now but thanks for your help. I will buy a phono amp, it's only £22 Happy New Year

I'm not familiar with the Philips R12 (I can't find that model on Google) but perhaps it has a built-in phono pre-amp?  I may be wrong about the Yamaha DSP-A5 but when I looked at its specs, it didn't have a phono input.  I assume you are using your Philips deck plugged into Aux? As for the RX2, I happen to be restoring an RX2 at the moment myself, and I also have another in full working order.  It has two adjustments which depend upon which cartridge you have - usually it would be an MMC5 in an RX2, but could also be an MMC4.  On the underside of the deck there is a small dial you adjust with a screwdriver to point to the correct type of cartridge, and then on the tonearm itself, you adjust the counterweight depending on the type of cartridge.  Turn it all the way past zero as far as it will go, then turn it back to the right pressure fo the stylus.  For an MMC4 that's 1.2g, or for an MMC5 that's 1.5g.  

Oh, and Happy New Year to you too!  Where are my manners...