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

Boater Sam · 23rd Feb 2016, 10:35 am

Checked on the Marconi 857 diagram, its completely different!
The reservoir cap goes to ground but it is connected to the other side of the speaker energising coil! Weird.

Correct, Laurence, I was looking at the thumbnail only. It has a -HT rail for bias on the valves. But it should make no difference to the OP putting the +HT back together.

Looking at the 2 diagrams, it will be preferable to use the HMV one, the Marconi one has several differences. Maybe this is why the original repairer confused the issue?

23rd Feb 2016, 10:35 am	#55
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: HMV 653 Broadcaster all wave. Checked on the Marconi 857 diagram, its completely different! The reservoir cap goes to ground but it is connected to the other side of the speaker energising coil! Weird. Correct, Laurence, I was looking at the thumbnail only. It has a -HT rail for bias on the valves. But it should make no difference to the OP putting the +HT back together. Looking at the 2 diagrams, it will be preferable to use the HMV one, the Marconi one has several differences. Maybe this is why the original repairer confused the issue?