Aldehyde-functionalized polyethers containing thiomethylaldehyde groups are described. Burn-in is carried out by using a frequency lower than the operating frequency of the transistor and is higher than the response frequency of impurities included at the impurity level of the transistor. Some embodiments provide load-balanced cluster printing through a printer-independent, driver-independent print system component. The valves are inserted in the bosses and retained by a preferably stamped bracket and the bracket, retaining plate and gasket secured to the manifold deck by common fasteners.