Given JM's concern for affordable high quality gear for the music lover unfortunately unable to delight the palate with hi-end offerings I would think he may be interested in a quality ST-70 "tribute" amplifier that isn't nearly as dear as the Filarmonia.
I'm thinking of Mappletree Audio Design's Stealth 60C. Actually the Stealth 60C is not accurately speaking a ST-70 "tribute" amplifier but like the Filarmonia some connection is obvious; in the case of the 60C one such is that the driver board is available separately for ST-70 restorations/rebuilds, it appeared prior to the 60C in fact.
Ugly Duckling notwithstanding JM may find the 60C worth looking into. The proprietor, "Dr. P", is also a very amicable fellow and I would think the inquiry would be a pleasant one.