These toroidal AC stepdown transformers are all ex Australian audio equipment manufacturing, there is nothing wrong with them at all but being ex production, there is a couple of points that should be noted ...
HARDWARE SPECIAL NOTE:
This toroid is a "bare bones" unit, ex commercial equipment production stores.
This means the mounting kit is NOT supplied (metal disc & 2x plastic washers plus bolt/nut)
BUT
The centre of the toroid is "potted" (epoxy resin filled), centre hole drilled and ready for the mounting hardware.
Toroid transformer mounting "kits" are readily available from electronic distributors e.g RS Electronics and you just need to choose the diameter you require.
SAFETY CAUTION: When mounting toroidal transformers think carefully about what you are doing! Remember that it is important that your transformer be mounted in such a way that the mounting screw and the metal chassis will not form a closed loop through the center and thereby create a shorted turn on the transformer Believe me, this is NOT a good thing to do!
Never heard of Australian designer and manufacturer of inductor based products, Harbuch? (If not, it is then likely that you have been living in a cave!)
Harbuch Electronics is a very respected Australian manufacturer of inductor products i.e audio, video and power transformers - their products were widely used in the local broadcast and audio industry. Well known for their very high quality, high reliability products - particularly in the field of professional audio.
HARBUCH ELECTRONICS (Australia) - Toroidal Transformer
HERE is their website (although it doesn't seem to have been working properly for quite some time now - I think I read somewhere that the original owner was retiring, but not sure about that)
Made in Australia
Model: A2411
Primary: 240V AC
Secondary: Dual 9V AC @ 15VA
All windings are colour coded, Orange/Orange is always the primary and the remaining colours are secondary wires (Yellow/Red 9V & Blue/Grey 9V)
The transformer labelling indicates which colours are the appropriate secondary windings
Epoxy resin filled, centre hole drilled
NO MOUNTING HARDWARE SUPPLIED
This is raw manufacturing stock, almost ready for the assembly line but the mounting kits (metal disc, 2x plastic discs and bolt/nut) are NOT included
Read up on the correct mounting solutions for toroidal transformers, it is extremely important that you get it right
DIMENSIONS:
60mm diameter x 28mm height
Epoxy potted centre
Primary & secondary flying leads terminated as bare tinned wire (Primary stranded and Secondaries are enamel coated copper)
TESTING:
Although brand new, I wanted to check the secondary voltages (both secondary windings) J.I.C (Just In Case)
Tested using the domestic AC supply, nominally 240V AC
Secondary voltage measured at each secondary varied between 10.55 ~ 10.52V each winding being identical under NO LOAD conditions
I have included a printed paper label for each transformer, with my secondary voltage (no load) test results indicated on each.
Fantastic little (low cost) AC stepdown toroid based transformer to supply your 'project' low power dual rail supply or connect the secondaries in series (in phase) for an 18V ouput (under load)
