All Lampi DACs are tube rectified and form what I recall, only some of the first generation Atlantics were ever solid state rectified.
So, the only way to determine how a Lampi DAC is to sound with a solid state rectifier in place would be through using something like this:
This octal based solid state rectifier is a cost effective replacement for any of the following tubes: 5AR4 / GZ34, 5Y3, 5U4G / 5U4GB, 5R4 / 5V4 / 5Z4 Not only is this an inexpensive alternative, but this solid state rectifier will firm up your low end. If you have too much sag in your low end, then
www.tubedepot.com
or this:
The above are commonly used in guitar amps, since the phenomenon of rectifier sag (which they try to "cure") is more evident in these types of tube amps rather than audio tube amps, let alone tube preamps or tubed DAC output stages.
Despite the proliferation of solid state rectifiers and solid state rectifier modules (like the above) it is not at all uncommon for tube rectifiers to still be found in modern guitar amps for their special sound properties (they create more of an "ebb and flow" type of sound) by attempting instead to accentuate that phenomenon and make use of its specific application towards achieving distinct compression characteristics in the output stage when the amp is driven hard into overdrive.
However, this is a far cry from Lampi's application of tube rectification as the 5V (5U4's and the like) and 6V (6X5 in the case of the Amber) rectifiers used in Lampis are highly unlikely to ever cause any type of sag (or even more unlikely, overdrive) with the voltages and design objectives typically found within these DACs.
It never hurts to try of course but please, read the note from the first page cited above carefully and consult Lampi before giving any of these a try :
Note: Please be advised that this replacement will increase overall B+ (plate voltage) by 10-20%. If your filter caps are older than 20-25 years, we suggest you replace them before installing this solid state rectifier.