[laipplyken]

From your voltage readings it seems as thou your  primary of your 1st IF transformer is open.  Measure the HV on the connections of the transformer (IF). If you are lucky  you won't find any HV there, meaning that the loss of HV is somewhere else or a broken coil lead inside the IF can. Short of that you'll need to replace that transformer.

Terry

Going back to the voltage reading I miss type 6a7 and 78 RF. The 6a7 is 271v and the 78rf is 4v. Sorry that may change your perspective a little.