Does anyone know the purpose of the Baking switch (located to the right of the Source switch) on the Finnigan Delta S and 252 models? On the Delta S, has anyone tried replacing a faulty switch? Thanks, Chris -- Christopher Osburn, Ph.D NRC Research Associate Naval Research Laboratory Code 6115 4555 Overlook Ave. SW Washington, DC 20375 202.767.1700 - phone 202.404.8515 - fax [log in to unmask]