Have a look at this!
Was my favourite book on hifi in the '60's. Philps components were available in South Africa from a company called Domescor and even though I was young and thus impecunious I bought two special output transformers for the ECL 86 based SE amp described on pages 35-41. The OPT is described on P 37. A wonderful sounding little thing that I rebuilt three times over the years.
Well written by an engineer whose forte was actual valve design for Philips.
https://www.scribd.com/document/350840493/Rodenhuis-HiFi-Circuits-2-pdf
Was my favourite book on hifi in the '60's. Philps components were available in South Africa from a company called Domescor and even though I was young and thus impecunious I bought two special output transformers for the ECL 86 based SE amp described on pages 35-41. The OPT is described on P 37. A wonderful sounding little thing that I rebuilt three times over the years.
Well written by an engineer whose forte was actual valve design for Philips.
https://www.scribd.com/document/350840493/Rodenhuis-HiFi-Circuits-2-pdf