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

Diabolical Artificer · 25th Aug 2019, 8:00 am

Use a Zobel R/C, something like a 10r and 0.1u, across the OPT sec, this will make the primary Z less dependant on the speaker, whose Z varies with frequency anyway. The 10r needs to be 5W or so. Play about with the value's with 4r7 to 20r and 0.1u to 10n ish.

Andy.

25th Aug 2019, 8:00 am	#12
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,667	Re: Output transformer - when needs must Use a Zobel R/C, something like a 10r and 0.1u, across the OPT sec, this will make the primary Z less dependant on the speaker, whose Z varies with frequency anyway. The 10r needs to be 5W or so. Play about with the value's with 4r7 to 20r and 0.1u to 10n ish. Andy. __________________ Curiosity hasn't killed this cat...so far.