[bridkarl]

Thanks. That seems to clear up my confusion. This is interesting as I’ve never seen one of these 7Y4 loctal rectifier tubes before. 

Apparently if I understand this right it’s using the center pin as a ground connection between that point and the Bakelite block where it hooks up to the .01/.01 caps on pin 1. 

Have to say it threw me when I first looked at this - counted all the pins and saw the black wire soldered to the center pin. It should be visible on the picture right below the red wire.

Until I looked at the tube data sheet and realized the pin connected to the shell I thought it had been miswired.  As I may have said I’m the second person to have recapped this so I’m trying to check and make sure nothing was done amiss.