[Racal] New to RACAL list looking for VLF EPROMS RA6790/GM

[Anderson, Craig - Ext. 1365]

>From time to time I have seen EPROMS listed on Ebay for the extended
frequency EPROMS for the RA-6790/GM.  I have a very late model 6790 but
it, like most 6790s, doesn't go below 500KHz.  Anyone know where these
EPROMS or source listing can be obtained?

Craig W9CLA