Behold, Andrew VK3BFA signalled from keyed 4-1000A filament:

.......was caused by the
"golden screwdriver" of a previous owner.

That reminds me of of repairing CB's in their hayday - 90% of what come
through the shop were victims of that.

Glad you got it ironed out :-)

--
Gregg t3h g33k
"Ratings are for transistors....tubes have guidelines"
http://geek.scorpiorising.ca