If I am not mistaken the link below has a drop in replacement for the 328's in the R390A dial http://www.led.net/datasheets/Pages/fsn_nsn_qualified_based_leds/67b.htm<http://www.led.net/datasheets/Pages/fsn_nsn_qualified_based_leds/67b.htm> Kenneth A. Crips W7ITC, AMI 873 with Irish Terriers Chic' Beezie and Cowboy. In this house Vacuum Tubes still rule.