[TowerTalk] Preamps for MF and HF

[Jim Lux]

I've got a DX Engineering AVA-3 preamp here.  It's designed to work with a short monopole and supersedes the other preamps that they used to sell (e.g. Clifton labs, etc.) for low frequencies.
The input Z is about 1000 ohms with 200 pF in parallel, and I was wondering if that's changeable  (higher R, lower C) (perhaps with a change in performance).
The other thing is that it would be nice to have more gain (it has jumpers for -6, 0, and +6).