The primaluna and Tjoeb are made by the same people so if you are happy with the luna....
I have the fuly upgraded 4000 with Amperex NOS tubes for about 2.5 years now. Thing works fine still and sounds great. Only issue is that the RCA's are too close togetehr for fat interconnect cables and I thing my interconnects have caused one of them to become intermitant when wiggled. Not a big deal if I don't wiggle ;-)
Ed
I have the fuly upgraded 4000 with Amperex NOS tubes for about 2.5 years now. Thing works fine still and sounds great. Only issue is that the RCA's are too close togetehr for fat interconnect cables and I thing my interconnects have caused one of them to become intermitant when wiggled. Not a big deal if I don't wiggle ;-)
Ed