UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

sobell1980 · 22nd Feb 2016, 7:44 pm

My meter reads 0.00 ohms with the leads touched together. The service data specifies that the secondary should test at 0.5 ohms. If you look at the photo, two leads come our either side of the secondary as normal then on one side you have an additional two like they are paired together as well as the one for the speaker connection. I'm afraid Chris I have no means of powering thus up with low voltage ac unless I can use my sig gen and my scope? This set is a real mess. Snipped wires all over and stubs of wire sticking out of tag boards. I'm just wiring back as per circuit diagram. I am finding the Marconi version of the diagram easier to follow. However, as per my previous post one diagram shows an earth connection to the opt and one doesn't. This could explain the extra wires. But why would the secondary need an earth, would it be giving it a ground 0 volt reference?
Thanks for your reply.
Dave.

22nd Feb 2016, 7:44 pm	#41
sobell1980 Octode Join Date: May 2011 Location: Bromyard, Herefordshire, UK. Posts: 1,241	Re: HMV 653 Broadcaster all wave. My meter reads 0.00 ohms with the leads touched together. The service data specifies that the secondary should test at 0.5 ohms. If you look at the photo, two leads come our either side of the secondary as normal then on one side you have an additional two like they are paired together as well as the one for the speaker connection. I'm afraid Chris I have no means of powering thus up with low voltage ac unless I can use my sig gen and my scope? This set is a real mess. Snipped wires all over and stubs of wire sticking out of tag boards. I'm just wiring back as per circuit diagram. I am finding the Marconi version of the diagram easier to follow. However, as per my previous post one diagram shows an earth connection to the opt and one doesn't. This could explain the extra wires. But why would the secondary need an earth, would it be giving it a ground 0 volt reference? Thanks for your reply. Dave.