I can't find anything on this set. The set has no contrast. When you turn the knob it varies a little but the picture is soft. Checked the tube and it checks like brand new.( funny for a 15yr old zenith). Need schematic of contrast circuit. or print of the whole TV. al marquardt ampm@xxxxxxx Al Marquardt Electronic Repair 206 W Main Girardville Pa. 17935 ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/