[Boatanchors] Drake TR-3 filament line fuse ???

[Bill Pancake]

Decided to take the Drake TR-3 off the shelf and see why it won't power-up using a known good AC-3 power supply.  Schematic shows a 8 amp fuse in the filament line coming off pin #4 of the power plug.

Can anyone tell me where it is and what it looks like??? On this rig it isn't obvious anywhere.  Appreciate any tips on locating it.  Bill, wd0x at arrl.net