Topband: Hi-Z Delay lines and new amps for four square

[Missouri Guy]

> 2) I have four of the new amplifiers which I understood to be 
> waterproof but
> there are two holes in the back of each amplifier case which seem to 
> open to
> the inner chamber.   Are these new amplifiers really water tight?

Doug,

I don't know about those particular amps, but it's good practice
to have two, *small* vent holes, in the bottom of the cases to allow
ventilation to prevent build up of condensation.  One hole
does not provide for cross-ventilation, thus the two holes.

73,
Charlie, N0TT