How to Improve Gain for RCA on Preamp. Can it be done?

I am using a MM cartridge. My TT connects to a 90’s luxman integrated receiver with phono stage (not bad actually) but I could not for the life of me find the phono output (or figure it out). This is the closest I could find ...

Phono MM (5 mV Input Shorted) : 82 dB

What phono stage output should I be striving for?

Okay, thanks, it helps a lot to know this is a card in an integrated amp. The "specs" don't help at all. But knowing it is a card helps a lot.

What you should do is look for a phono stage. You want one with a lot of gain. It will help to know the output of your current MM cart but you probably just want something with at least 50dB and even better 60dB gain. 

Gain is the amount by which the input voltage is amplified. Nobody likes math but if you can handle a little this will walk you through exactly how to find the right phono stage for your cartridge, at least in terms of gain. Rest assured just about any decent standalone phono stage will sound a whole hell of a lot better than what you have, even if only a hundred bucks or so. (The card that is in there now probably has $1 worth of parts on it, if that.) 

Thanks again!  I agree it's time to get a real dedicated phono stage.

 But just to let you know, I did try a highly recommended phono stage for a couple of hundred bucks and it was no where - I mean no where - as good as my Luxman.

I remember getting my first "highly rated" phono-stage at that price point long ago. It was truly terrible. Unfortunately phono-stages are not good at that price point. Typically they are only ok at ten times that. I would save up and then buy used. I would think Audio Research, Conrad Johnson, of course Luxman makes one that is not very expensive.

Always like this with RCA vs XLR. Technically, gain is the amount by which the input signal is multiplied. Gain is always fixed. Gain is fixed in amps, gain is fixed in preamps. You do not change gain other than by redesigning or modifying the amplifier stage within the component.

What you are seeing is not gain. It is simply different input voltages. XLR always because of he way they are wired result in greater input voltage than RCA.

@millercarbon Just so you know, this isn’t how its supposed to work. In a balanced system, the signal is not generated with respect to ground; ground is independent of the signal. So the RCA and XLR outputs should be the same voltage!

Think of a phono cartridge, which is a balanced source. Its output does not change if you run it balanced or single ended. The ground is the tonearm tube; its independent of the signal. Think of an output transformer, whose secondary can drive either single-ended (with one side at ground) or balanced (neither side at ground; ground is merely chassis with no other connection to the transformer). The output voltage is the same in either case.

When you see the gain difference as described, what is happening is that the inverting and non-inverting aspects of the balanced line are generated with respect to ground rather than each other. IOW, each is a single-ended output, with one out of phase with the other. This type of connection does not support the balanced line standard, since the ground connection is essential for its operation to complete the circuit.

So its not ’always like this’ as you say, its just like that if the equipment isn’t supporting the standard.

Is there a way to improve gain on a preamp using RCA?

Yes, a transformer.

https://www.jensen-transformers.com/