[Antennas] Viking antenna tuner question

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Maybe offtopic but don't think there is an antenna tuner list.


I have a used Viking MB-V-A

It has the swr bridge installed.
I replaced the battery but the swr bridge does not work.


I'm assuming it's the normal diode type bridge and before I open it up does
anyone know the value of the diodes?
I have a manual but it doesn't indicate the value.

I know they aren't too crucial.

Anyone have experience with this?

I searched the web and came up empty.