THIS AUDIO TRANSFORMER IS A "PULL" - REMOVED/WORKING
Ex obsolete (no longer has a useful purpose) analog audio eurorack card, designed and manufactured in Australia.
My problem is that I have no information about this transformer and in particular, the impedance ratio. I have hunted around with most of the audio transformer old timers in the Australian audio industry but have come up blank - many use nice easy identification such as ATxxx with the Harbuch's (AT = Audio Transformer - nice and sensible product coding) but nothing on a 443xxxx series of audio transformer
UNKNOWN MANUFACTURER - Audio Transformer
Ex Broadcast Industry
Iron core, E Laminated core
Two isolated windings which are terminated as 'flying leads' just 5mm long (enough to mount on a PCB as this transformer was originally mounted) - attaching longer flying leads would be an easy task.
Completely unmarked other than the type number on the top of the transformer
TYPE: 4430642
Based on the fact that the card this transformer was removed from was Australian designed and made (1990's era), it would be a fair assumption that the transformer was locally sourced but I have been unable to identify who that manufacturer may have been.
It's purpose on the card was as a low level audio signal line output transformer.
DC measurements:
Winding 1: 0.2 Ohm
Winding 2: 1.2 Ohm
Impedance is unknown and practically all my test equipment (stable, accurately calibrated AF signal source and AC millivoltmeter) have found new homes so I am a bit stranded being unable to make some reliable frequency dependent tests. Most likely it may work out to be 150, 300 or 600 Ohm Z on at least one winding @ 1Khz but that is just my "guess" based on the external impedances typically used with pro audio equipment.
Wire thickness is the same on each winding, measures 0.45mm OD (digital micrometer) and is enamelled.
Transformer dimensions:
21mm height x 27.1mm wide (excluding metalwork for the mounting feet x 19mm across the core
2x side flanges (with 2mm holes) to secure the transformer, these are spaced 32mm apart (hole centre to hole centre)
Weight: 30g
The complete transformer has been coated in a lacquer type material (light brown)
This audio transformer is offered with the possibility of repurposing to suit custom designed audio equipment