Hi all, The crystal oscillator in my 5061A has developed an intermittent fault. I thought I had it fixed but it turned out not to be the case. The fault appears to be in the internal oscillator oven, not the outer oven control area. That section is surrounded by cast foam and is not easily accessible. If anyone here has one of these units and would be happy to mail it to me in Australia I would be happy to hear from you!. All costs covered by me naturally. Regards, Morris Odell