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Old 21st Jun 2021, 10:21 pm   #9
nzoomed
Pentode
 
Join Date: Feb 2016
Location: Tauranga, New Zealand
Posts: 132
Default Re: Winding a new output transformer for a Philips B5G64A Radio

So I have had this transformer soaking in petrol to dissolve all the pitch for two weeks now and have unwound it last night.

Its a very basic transformer, no interleaving at all, the secondary was wound on first and the primary on top.
There was a thin piece of paper between each layer of wire.

I was told that a single ended el84 transformer should be about 3000 turns, and this is close to that at around 3500 turns.

The "humbucker winding" seems to be much lass than that however at only about the first 90 turns.
Is the 5% value based on the amount of turns or the actual impedance?

Im thinking of splitting the primary into two and putting the secondary in the middle, I was told this is usually acceptable.

Not sure what varnish to dip the transformer in when wound, i think its polyurethane that is being used from what I can tell from the smell of new transformers ive bought in the past.
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