Behold, Tony signalled from keyed 4-1000A filament:

do exist a simple method for modify a home radio tuner to get FM and AM
frequencies out of the range?

Yes, but it's not simple. Your tracking will be messed up and alignment
with an oscilloscope needed.

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