I can not find the previous post on this problem. I put in the original Output transistor , I soldered the driver transformer and connections in the Horiz. section. I did change the .47\50 cap at the driver transformer. Is there some thing else that has to be changed on this chassis. The transistor gets very hot. The waveform looks very clean at the base of the H.O.T . it starts to get hot after a few minutes. The original problem was a blown HOT transistor and the special damper diode . The R523 (.68 ohm resistor ) was over heated but not blown. I replaced this also. If I remember correctly these do run hot, just didn't wanted to send this out and have it come back... thanks for your input, Bruce B&T Electronics. Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.