Try this website:
http://tubes_tubes_tubes.tripod.com/id87.html
"ccp" wrote in message ...
Hi,
Busted the function switch on my old Heathkit SB-300 rcvr. Anyone know
where a replacement might be available or if anyone is parting out a
sb-300, 301 or similar. The heath part # is 63-421. Thanks, KB4MRH