So many excellent replies and information from all of you!

I put together a temporary voltage divider for test purposes and powered the HP-23 up on my Variac. 

I sent out a test and was very happy to see 7 hits on the RBN!

My next step is to neaten up the circuit and enclose the components in a project box. Once it is put together, I will be ready to get on the air with it along with my R-27.

Again, thanks to all!

73,

Russ K1RWT