09-12-2016, 07:12 PM
I've been using them since 1970s ... for transistors.
They are very poor compared with mains transformers robbed from old clock radios (£2 in Charity shop, or about £5 new in Argos/Tesco from time to time, other useful parts).
I tried four kinds of those small transformers, the LT44 was only nearly usable with a 64 Ohm speaker and 30V HT. Much poorer than any small mains transformer.
They are just too small, too low an inductance and too low a ratio. They are not very cheap now, either. Buying up S/H clock radios is cheaper. If you need a 4 gang AM/FM (or LW/MW & SW) poly varicon, small speaker, volume controls, 10.7 & 455 ceramic filters, MW ferrite rod and a miniature mains transformer, then a new "budget" clock radio is very good value indeed for parts.
So, I'm going on theory, practice and cost.
They are very poor compared with mains transformers robbed from old clock radios (£2 in Charity shop, or about £5 new in Argos/Tesco from time to time, other useful parts).
I tried four kinds of those small transformers, the LT44 was only nearly usable with a 64 Ohm speaker and 30V HT. Much poorer than any small mains transformer.
They are just too small, too low an inductance and too low a ratio. They are not very cheap now, either. Buying up S/H clock radios is cheaper. If you need a 4 gang AM/FM (or LW/MW & SW) poly varicon, small speaker, volume controls, 10.7 & 455 ceramic filters, MW ferrite rod and a miniature mains transformer, then a new "budget" clock radio is very good value indeed for parts.
So, I'm going on theory, practice and cost.
