Hi all!
I agree with you about the Synthesis gear. I bought a combination: an older Synthesis Harmony, two Sythesis The Theatre monoblocks and the Synthesis CD player. I liked the way it looked.
When I got home and attached it for fun in the dining room to an old set of Rogers Studio 1 loudspeakers I was a stunned at how good it sounded! I used a simple, but very good Topping D70S DAC. So my experience with Synthesis is indeed a good one! I am now in the process to find the best set of matched tubes to place in these pre/power combo. I do the matching of the tubes on a calibrated AVO MKIII tube tester and the biasing should not be a big problem.
What I wanted to let you know: I own quite a lot of gear and I like to try a lot. My tip: try to find a USB bridge for your "older" DAC. ;o)
What I am using for a long time is a VTL Reference DAC. You know maybe... the one with the two Ultra Analog DAC's in there and with tubes form 1990. I purchased a USB bridge X-SPDIF 2 from Matrix Audio to cleanup the USB signal and this changed my whole DAC/streaming experience. It merges the old world with the new world.
I am now streaming from a specially powered HPE SFF Z240 workstation (NVMe based) through the Matrix Audio X-SPDIF 2 to the VTL Reference DAC.
Maybe you have tried allready, but you might try a X-SPDIF 2 in front of your Lampizator?