JLH Monoblocks...PSU boards are different Mk's....

Hi Folks
....finally get onto recapping/fettling these 2 JLH Monoblocks, and just noticed that the PSU boards are marked as :
HART 1150 and HART 1150-2
(I've attached a rather poor pic.)

This might be one for one of the JLH aficionados 'out there', but hoping to discover the essential differences between the 2 vintages, as I'd like to bring 'em both up to 1150-2 spec....if that's possible.

(I'm a bit obsessive...possibly autistic about things like that!!:D )
 

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