[TowerTalk] Balanced Balanced Antenna Tuner Air Variable?

[kd4e]

I have the matched set of inductors for the homebrew
A Balanced Balanced Antenna Tuner QST February 1990

The article mentions a 1.5kv 488pf (minimum) air variable
if one is to handle 1.8mHz (I did not notice if those
values presume full legal power).

Anyone built and/or owned one of these and what values
have proved best & what has been the performance, please?

Will one of these work 160-10M or 160-6M or does one
need to optimize for 160/80/60/40/30M vs 20/17/15/12/10/6?

Thanks! & 73, doc kd4e