UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - AZ31 as rectifier for a stereo Mullard 3-3?

qualityten · 3rd May 2021, 6:03 pm

Thanks for the steer. Interesting that the Ferguson radio was running the rectifier at its limit.

The transformer has two 6.3V windings. In the Ferguson circuit, one supplies the heaters of the EL33s. The heaters of the all the other valves are supplied by a 6.3V winding which is returned via the chassis ground. Could I use the latter for the EF86s and use the other winding for the EL84s and an EZ81? Or is the transformer simply unsuitable for this application?

3rd May 2021, 6:03 pm	#4
qualityten Octode Join Date: Feb 2009 Location: Wallasey, UK. Posts: 1,314	Re: AZ31 as rectifier for a stereo Mullard 3-3? Thanks for the steer. Interesting that the Ferguson radio was running the rectifier at its limit. The transformer has two 6.3V windings. In the Ferguson circuit, one supplies the heaters of the EL33s. The heaters of the all the other valves are supplied by a 6.3V winding which is returned via the chassis ground. Could I use the latter for the EF86s and use the other winding for the EL84s and an EZ81? Or is the transformer simply unsuitable for this application?