Charles,

There's an 8.400 mc crystal on eBay right now:

http://cgi.ebay.com/8400KC-CRYSTAL-F...06QQihZ008QQca
tegoryZ4671QQrdZ1QQcmdZViewItem

Item number is 9741742906 in case that link messes up.

73,
Dean K5DH


In article ,
says...

Just got a Heath Sixer. I built on way back when (in the olden days). I
need
a 8.400 mc FT243 Crystal. I will swap your one for my two. 7.045 and 7.0
50
Let me know. Charles