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Old 18th April 2013, 11:47 AM   #1
Haman47 is offline Haman47  Australia
diyAudio Member
Join Date: Mar 2013
Location: Adelaide South Australia
Default Joining output windings

I have picked up an output transformer in which the secondary appears to have been made with 4 independent 4 ohm windings. If the transformer is to be used to drive an 8 ohm speaker then should I join all of the windings in series then tap it across 2 of the windings, or should I just join 2 of the windings to make 8 ohms and ignore the other 2 windings? Also, when joining windings, do I have to make sure they are in phase with each other, and if so, how?
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Old 18th April 2013, 12:18 PM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Four independent '1 ohm' windings is more likely. This is how Sowter often do their transformer secondaries.

All in parallel give 1 ohm.
Two parallel pairs, then connected in series, give 4 ohms.
Two in parallel, connected in series to the other two, give 9 ohms.
All in series gives 16 ohms.

Using windings in parallel reduces resistance for the lower impedance options.
Correct phasing must be used - colour coding is the usual option, or use an AC meter.

For 8 ohms you can use either the 4 ohm or 9 ohm setting.
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