[Amps] RF Chokes for the SB-220

[Robert Dorchuck W6VY]

I am trying to rebuild a SB-220 amp.  I found what appears to be a resistor in 
place
of the RF choke on the grid of both tubes (RFC-4 and 5, 1 mh pi-wound).  The 
color
coding is yellow-violet-black-red and it measures 47 ohms which almost matches 
the
color code.

Can anyone point me to a source for the correct choke or suggest a good 
replacement.
Any help appreciated.

Thanks.

Bob  W6VY