B&W 801 crossovers

Which model and series 801? Matrix? See my crossover upgrade thread.

Vegas,

Get the NC's. Much more managable now fhat teo bixes are used unstead of four.

Vegas,

Get the NC's. Much more managable now that four boxes are used unstead of four.

I am slightly detouring this thread for selfish intent, as I doubt any answers to my query will benefit the OP. But, here goes anyway: Is there still merit in the old units such as the Heathkit XO-1 tubed crossovers? Assuming their operational condition is as should be, possibly with upgrades? When used with a basic tubed system, how may they fare compared to modern examples, such as a Marchand? My question is more than academic. Thanks in advance to any respondents, also those just giving it some thought :)

The speakers are B&W 801 matrix series 2.