Transformer or choke and RC unit - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Ed_Dinning · 14th May 2022, 4:47 pm

Hi Adrian, plenty of IV transformers about, commonest ratio was 3:1, but many of them will need rewinding as one of the windings will be O/C.
Not difficult to do, but tedious due to the 1000's of turns needed.

Typically the speakers were a few thousand ohm impedance; not that the DC resistance would only be a few 100 ohms.
A modern speaker with a suitable output transformer works well

Ed

14th May 2022, 4:47 pm	#21
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Transformer or choke and RC unit Hi Adrian, plenty of IV transformers about, commonest ratio was 3:1, but many of them will need rewinding as one of the windings will be O/C. Not difficult to do, but tedious due to the 1000's of turns needed. Typically the speakers were a few thousand ohm impedance; not that the DC resistance would only be a few 100 ohms. A modern speaker with a suitable output transformer works well Ed