Kinda hard to do since the crystals are in HC-18/U holders! Glen, K9STH Website: http://k9sth.com --- On Tue, 6/14/11, Carl <km1h at jeremy.mv.com> wrote: Set up a one tube or transistor test oscillator. If certain one is dead remove the case and gently clean the quartz and pressure contacts. A sig gen and scope can also give an indication.