Determine transformer power/current capability

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I actually wanted to kind of keep it all together. I know there would be improvement by separating it the whole way but I don't have that possibility right now. And with two transformers for the pre + one for the power amp, it would get really tight in there. Even if I'm planning on mounting the 2 transformers, the filter caps and the power amp heatsink on top of the chassis, tube amp style.
 
I've had great results with some other mods and suggestions from them ( for the rega planet for example) and they do seem to be pretty specialised in naim gear, that's how I first got on to their site. So according to you a single 0-27V 50VA transformer with the 2 regulaters connected in parallel would be more than good enough for what I'm doing here ?
 
There is no negative rail as far as I can tell. A dual secondary should be enough for two + rails. Like the attached (to my knowledge, feel free to correct).
 

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This is indeed what I need just for the preamp but as I said before (sorry my answers might get a bit lost in all the other posts) I will need one negative rail for my riaa circuit. I have one lying around from a sansui au 999 that I really like a lot and I won't do anything else with it so I decided to put it in here. I uses a -25v rail. I'll be using the same regulator as for the preamp but in a negative version.
 
Actually no it's not one rail per channel, it's a preamp stage in two parts, one before and one after the volume pot, and each one has a separate rail. I know it shows 3 rails but the 2 last ones are connected on the circuit board.

NAC152XS.jpg
 
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