UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Valve substitution question can an EF86 replace an EF804?

Ed_Dinning · 19th Jun 2022, 7:53 pm

Hi UB, output transformers can be wound from scrap transformers salvaged from old sets.
These will usually be Stalloy lams but if run at about 0.5 T they should sound OK.
Bobbins can easily be fabricated and there are not that many turns required; Wires.co.uk can supply the wire quite reasonably.

Because of safety issues I would only recommend this for output transformers on transformer isolated sets and not to build mains transformers

Ed

19th Jun 2022, 7:53 pm	#37
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,198	Re: Valve substitution question can an EF86 replace an EF804? Hi UB, output transformers can be wound from scrap transformers salvaged from old sets. These will usually be Stalloy lams but if run at about 0.5 T they should sound OK. Bobbins can easily be fabricated and there are not that many turns required; Wires.co.uk can supply the wire quite reasonably. Because of safety issues I would only recommend this for output transformers on transformer isolated sets and not to build mains transformers Ed