Is 60dB gain enough for Kleos?

Some 60db phono stages will be fine, and others will not be.

Assuming that your line stage preamp provides a reasonable amount of gain, say 10db or more, and that your power amp has a typical sensitivity number, say 1.5 volts or less (unbalanced), you'll have enough gain. The more important question is the signal-to-noise ratio (s/n) provided by the phono stage. If that is not particularly good, you may wind up with objectionable hiss levels.

I couldn't find a s/n spec for the Fosgate Signature. The last paragraph on this page, from the TAS review, is encouraging though.

However I would suggest that what would constitute the "pertinent experience" you are looking for would be specific experience with the Fosgate. Perhaps someone using it with a 0.8 to 1.0 mv cartridge could try turning up their volume control to a level around 6db higher than they would normally listen at, and indicate what kind of hiss levels result while no music is being played.

Regards,
-- Al

I would be cautious extrapolating from experience with the Linto. In addition to the fact that it is solid state, as indicated in its manual it is a very unusual design in that it drives the input signals directly into the amplifying transistors, with no loading network (the intent being to reduce noise); and it has an unusually high input capacitance of 4700pf (which may further reduce noise). The Fosgate differs in all of those respects, and also provides 4db less gain.

Regards,
-- Al

Dave, those numbers all seem reasonable to me, and I don't see any issues with them.

Gain, btw, is calculated as 20log(Vout/Vin). For the AV7005, that would be 21.6db for the balanced outputs, and 15.6db for the unbalanced outputs.

Again, as I see it the main spec-related question in this case is s/n performance, not gain.

Regards,
-- Al