Got back to looking at the plus this evening, I checked to see if the tube glowed. I could see a very faint glow from the glass tube at the rear of the CRT. I have also checked to see if the machine would boot from a floppy and it does. I've checked both the yoke connectors on the analog board and they appear good. No bad connections, unless the actual connectors themselfs are dirty.

Could someone also confirm with me if I've replaced the cap on C1 with the correct component. I've replaced the old cap with a 10uf 50v none polar capacitor. The Mac repair PDF i had, did not specify a uf rating, so it struck me it might be wise to ask. Incase i've chosen the wrong component.