Kevin,
Since the 830s uses valves (tubes on this end) no tuner is necessary.
Simply adjust plate and load or tune and load if moving more than 50
Khz.
I never required a tuner with my TS-820S.
Regards,
Jim, K4SQR

Kevin & Natalia wrote:
Hi All,

I have just built a 20m dipole as a temp antenna for home.
I will be driving it with a TS-830 transceiver, which uses valves in the
final stage.
I know that I can only use it close to the cut frequency, but want to build
a small tuner to allow me to go off the cut slightly.
I only want the tuner to be used on 20m, so I do not need any coil tapings
for switching bands, so maybe a couple of caps will do the job.

Look forward to any replies.

Regards

Kevin, ZL1KFM.