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G6Tanuki · 30th Jul 2019, 4:33 pm

Don't worry about the primary resistance as such, the more important thing is the impedance-ratio to get a good match between the 6V6GT and the speaker.

Pretty much any generic output-transformer designed to match a 5KOhm source-impedance to a 3Ohm speaker will do - the biggest issue can be whether the replacement physically fits the available space.

30th Jul 2019, 4:33 pm	#22
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Unknown Home Built TRF radio Don't worry about the primary resistance as such, the more important thing is the impedance-ratio to get a good match between the 6V6GT and the speaker. Pretty much any generic output-transformer designed to match a 5KOhm source-impedance to a 3Ohm speaker will do - the biggest issue can be whether the replacement physically fits the available space.