I have a HP 8551b, ser no 807-1979, and relay k4 is energizing
(filament overload relay for the bwo). Does anyone know where you can
buy bwo's anymore? The bwo is a Watkins Johnson, Model SE-213, Ser #
58958, it is a 2-4gc, heater 6.3V, appx anode 97V, cathode 7.2mA.
This has a date code from the 70's, and I picked up the unit for under
$60, so it doesn't suprise me at all that it's bad. I have a good
851b display, and really want to get this rf section running. As
always, if anyone can help, I'd greatly appreciate it.

Thanks,
Steve Kamego