Motorola setup

[Penthode]

Originally Posted by timmy

I thought the 8 volts would draw to much from the heater string

The TV has parallel wired filaments. Filament power= voltage x current.

If the tube filament voltage rating is higher, for the the same filament power the filament current will be less. That means the 8 volt tube will provide less of a filament load not a greater load.

The downside is running the 8 volt rated filament on 6 volts will mean it will not be as hot. If the tube was weak at 8 volts, it will be worse at 6 volts.