Hello!
The TX103 Moving Coil Stepup has 3 possible gains it can be wired for. These gains are 1:5 (14dB) or 1:10 (20dB) or 1:20 (26 dB). The usual way is to pick one gain that suits your setup and wire it for that. By far the most popular settings are 1:10 and 1:20.
I have had requests from several guys recently who have more than one cartridge they run on a regular basis - sometimes with quick swap removable arm tubes. Lucky buggers...
Some of these guys want to switch gain easily and so I have added an option for switching from 1:10 to 1:20 via a toggle switch. This option is described at the bottom of the MC step-up page.
Thanks!
John Chapman
www.bentaudio.com