HISTORY:
More mystery components from a box of goodies (workshop spare parts) I am sorting through at the moment, but what are the transformer specifications? I have no idea but I will provide as much information as I have been able to gleen on this transformer.
NEW Old Stock
Spare part for audio stages, most likely intended for interstage audio coupling/impedance matching. I suspect this is a 'special' manufacture from UTC/TRW USA as the part number points towards this being a UTC product and possibly intended for use with Collins communications equipment.based on part number series 677-xxxx-xx
There was a time when I had some spare parts for Collins solid state gear so I believe this was a spare part from that equipment, but I didn't record which model.
Identical construction methods used as the low power audio output transformer I also have advertised HERE
Small signal coupling, single tapped winding on each side.
Definitely for solid state use, NOT valves (not the earlier Collins equipment)
Fully encased in what appears to be a Black resin with flying leads
That is the overall picture, now to some detail ...
UTC (Division of TRW) USA - Small Signal Audio Coupling Transformer
Designed and made in USA
UTC were prolific designers and manufacturers of quality transformer products. I have tried to find this CR transformer series in their old catalogues but I have come up with blanks, I can only think that this was a 'special' production product.
Part #: CR-068 677-0217-00
I cannot find a reference to these part numbers from old UTC transformer datasheets (1970's) or anywhere else online ... its a mystery!
Primary & Secondary windings are single, with a tap on each side
DC resistance test ONLY (not Z) just to check continuity as I do not have much test equipment left these days and am unable to investigate the impedance or frequency response.
Winding A: 350 - 0 - 400 Ohm (Black - Red - Brown)
Winding B: 130 - 0 - 130 Ohm (Yellow - Black - Green)
DIMENSIONS:
This is a very small iron core transformer and obviously only for low level audio use.
20.5mm wide x 17.5mm x 10.75mm height
The mounting feet on either side extend each side by a further 5.75mm
COSMETIC CONDITION:
NEW
CLEAN
Undamaged in any way
Flying leads terminated with pre-soldered bare stranded wire
Now that I have taken photographs, made some measurements and written up this advertisement, the transformer has been returned to the original sealed packet I have kept it in - it will be supplied the same way.
