My Lamm LL2.1 Deluxe does.
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Yeah, the Sachs Model 2 will get u done...
I believe the Atmasphere MP-3 also offers this feature. Both outstanding preamps! They don't have physically separate L/R volume controls, but they have separate gain stages for both channels and a master volume control. Ignore either at your peril.
Just trying to understand why limit the options if a balance control serves the same purpose.Having Gain Trim controls allows you to not only set the balance but also the overall gain of the line section. An example might be if you have a digital source which typically has an output that is quite high (too high IMO, but that's a different matter).
With a balance control, you're pretty well stuck with the gain of the line stage which might mean that your Master volume control is most of the way down. This can make it difficult to use. With independent gain trim controls, you can set the overall gain structure and use the Master volume control as you see fit.
In most linestage/preamps with a balance control, the signal for each channel is going through two attenuators, one being the balance control and the other being the volume control which has two separate potentiometers to attenuate each channel. Having two separate volume controls eliminates one set of attenuators, but, it adds to difficulty in changing volume while maintaining proper channel balance. It is particularly hard to do remote control of volume this way.
In linestages that have relay switched resistors, the signal from each channel can be independently stepped up and down so that both volume change and channel balance will be achieved through the same stepped attenuator, thereby minimizing signal degradation. This also allows for easy remote control of both volume and balance.
To me, remote control of volume is an absolute must have feature. It is very hard to set the ideal volume level if you have to go back and forth between your chair and the equipment to listen to the result. It might be good exercise, but it makes for less than ideal listening.
I used a YBA linestage many years ago that had a troublesome remote control. I can't recall exactly what was the problem, but, I believe it had to do with the left and right channel becoming out of sync so that one had to constantly reset the thing so that both channels would track properly when changing volume. Otherwise, the YBA gear was quite nice.