I have being used at present a SS Pre Amp which is the Prototype of a Pre Amp design being commission built for me.
The EE has gave me the Option to add 13dB of Gain, of which I have been using to about 50% of what can be used.
With a CD Source and to meet what I class as a preference, the Gain is usually between 25% - 50% with only a small selection CD's not having gain added.
With the Vinyl Source no added gain is needed.