ADC 114A Transformers, Very Flat response, +/- 0.5dB, Rare!

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$162.5
Brand
ADC
Unit Type
Unit
Model
114 A
MPN
ADC-114A
Country/Region of Manufacture
United States
Unit Quantity
1
condition
Used
This listing is for a single, ADC 114A Audio Transformer.  A rare vintage unit.
Removed from recording studio equipment of the 1960's-1970s.
This transformer has identical windings on the primary and secondary.  (see diagrams in the photo section.)
Actually, you'll find that is has four (4) identical separate windings: Two on the primary and two on the secondary.
This makes these units well-suited for 1:1 isolation, or 1:2 set-up, or 2:1 step-down application (or any combination in-between).
These units were previously used in a 1:1 configuration; with the Center-Taps joined, using the full windings.
This transformer provides a very flat frequency response.
These must have been among the finest audio transformers that ADC produced at the time.
  • They have the unique specification:   +/- 0.5dB   30Hz-15kHz.
  • It is rated at +16 dBm maximum level,
These specs seem to be very conservative:
  • One random unit, tested in the 1:1, full-winding mode mentioned above, and the secondary loaded with 600 ohms,
  • This test unit measured +/- 0.5dB from well below 10Hz to over 25kHz.
Finally, many engineers use these creatively in the studio to add 'color' to electronic instruments, keyboards, etc.