Tektronix 2465B vertical shift problem

[ppppenguin]

Thanks for the suggestion. £93 with free postage.
https://www.qservice.tv/vpasp/shopexd.asp?id=1895

My registration on the tekscopes forum has finally been approved: https://groups.io/g/TekScopes/topic/2465...0,27485131

Chuck Harris makes some good suggestions but since Ch3/4 are OK his comments about the vertical deflection plate connections are surely not correct.