Yep I remember that being posted on here some time ago.
I think it may have been Dave Collins who posted it, he'd used it as a line amp in his mastering work at one point.
The Manley mono mic pre's that I remember from years ago were very similar, although the couple that I had used 6072's as the gain stages - I'm not sure what the White Follower tube was in them. These were the 40dB Mono's, although mine were prototypes out of David's studio I believe.
Yes the anode resistor value shown isn't optimum as we know it, but I'd need to look at the data sheet and find the operating point to say what would be a better value.
It would be very simple to turn that circuit into a mic amp with adjustable feedback for gan adjust.
As is, there's a 13dB or thereabouts pad on the input so removing that and connecting your input transformer there is a doddle.
On the units I owned, besides the negative feedback switch, there was a level control right after the input transformer. This can give rise to extra noise in the -6dB position if the transformer ratio dictates that the pot value be fairy high.
Something tells me that the input transformer ratio on the old 40dB units used to be about a 1:5 and the secondary pot/level control was a 50K which wouldn't cause much of a noise issue at -6dB, although the inherent noise for a 1:5 is higher than a 1:10.
Ya takes ya pick I guess.
But yep, probably very similar to the Mastering Labs pre amps.
Thanks for re-posting the circuit