I am no tech but I'll make a guess.

With these vintage stuff it's actually the mains transformer of the
AMP that provides all the electricity, although they are routed
through the preamp then back to the amp. Convoluted heh?

Not knowing what tubes are used, I can only guess 6V is likely
filament voltage for the tubes. If it is 6V AC then there must be a
secondary tap at the transformer which you can connect to the tubes'
filaments.

The 100V must be B+ related. I better not say more.

Of course you have to feed the mains to the primary of the mains
transformer of the amp also.

--- In doctorjohn_CheapTubeAudio@yahoogroups.com, "sward1087"
<tward1955@...> wrote:
>
> Can anyone help me figure out how to seperate a fisher tube amp and
> preamp. They were in a console and the preamp has to be plugged into
> the amp to turn it on. I checked power at the amp and found on
> terminal had 6 volts and another with 100 volts other than that all
> other pins are dead. Any suggestions on how to do this.
> Thanks
> Tim
>