Phono Preamp Question

gmsasso-

Why give up on the Foz? Consider a step up transformer thru the mm gain setting.

I have a Foz and found MC's around .3mv and less work fine this way.
A used unit/IC's is much cheaper than a new phonostage, and no sonic penalty.

https://www.audiogon.com/listings/lis9ciei-bob-s-devices-sky-10-solid-state

https://www.audiogon.com/listings/lis9ci5b-icon-mc-step-up-transformer-phono

"I'm going to roll some tubes in and out of the Fosgate..."

gmsasso-
As stated in the manual,the tube the makes the most audible change is V3(12AX7) 

Changing the other tubes will be very subtle at best. Very subjective. Over time, I've changed all of them including the rectifier, can't say it's "better" just different. The most important factor is installing QUIET tubes.

The Foz also seems to respond to a decent power cord. I also use AC regen(PS Audio Power Plant)

gmsasso-

This is an old thread I read when I decided to buy to Foz.
https://www.avsforum.com/forum/173-2-channel-audio/1357153-fosgate-signature-all-tube-phono-preamp.h...

There is some tube rolling discussion. Choice in tube is a YMMV thing and subjective. I tried a few, and presently have a Raytheon Blackplate.

The owners manual also mentions you can try a 12at7 as well in V3http://www.musicdirect.com/documents/pdf/AFOSSIGPHONO.pdf

The tube rolling thing will not help with your low gain concern for your cartridge.