OVERVIEW
Microphone transformers are used for impedance matching to the pre-amplifier stage – for mic preamp input circuits to match microphones to preamp, in tube microphones for matching high impedance tube circuits to normal output impedance, and in ribbon microphones to transform very low voltage, very low impedance ribbon motors to normal microphone output levels.
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PACKAGING STYLES
Our mic input transformers are available in:
- Wire Lead – Standard wire termination with retainer clamp
- PCB Mount – For direct soldering to printed circuit boards
TECHNICAL DATA
See the table below to view the datasheets and associated ISO information for this product:
| Product name | Impedance ratio | Turns ratio | Max input @ 30 Hz |
|---|---|---|---|
| A187A14C | 150 / 600 to 9k6 | 1+1 to 8 | -2.5dBu |
| A187A15C | 150 to 15k | 1 C.T. to 10 | -2.5dBu |
| A187A17C | 200 to 600 | 1 to 1.73 | -2.5dBu |
| A187A18C | 200 to 5k | 1 to 5 | -2.5dBu |
| A262A1E | 150 / 600 to 3.75 / 15 | 6.3+6.3 to 1+1 | 0dBu |
| A262A2E | 150 / 600 to 600 / 2k4 | 1+1 to 2+2 | 0dBu |
| A262A3E | 150 / 600 to 6k25 / 25k | 1+1 to 6.45+6.45 | 0dBu |
| A262A6E | 150 / 600 to 150 / 600 | 1+1 to 1+1 | 0dBu |
| A262A40E | 150 / 600 to 25k + 25k | 1+1 to 11.55+11.55 | 0dBu |
| A262A43E | 600 / 2k4 to 2k5 / 10k | 1+1 to 2+2 | 0dBu |
| A262A45E | 100 / 400 to 1k25 / 5k | 1+1 to 3.53+3.53 | 0dBu |
| A262A45E/1 | 200 / 800 to 5k / 20k | 1+1 to 5+5 | 0dBu |
| A262A47E | 150 / 600 to 2k5 / 10k | 1+1 to 4+4 | 0dBu |
| A262A48E | 150 / 600 to 1k25 + 1k25 | 1+1 to 2.89 + 2.89 | 0dBu |
| E187A | 800 to 800 C.T. | 1 to 1 C.T. | +6dBu @ 100Hz |
| J30A11C | 150 / 600 to 3k75 | 1 + 1 to 5 | +3dBu @ 20Hz |
| X187A | 30 to 50k | 1 to 41 | +3dBu @ 20Hz |
| X187B | 600 C.T. to 50k | 1 C.T. to 9.1 | +3dBu @ 20Hz |
| Z1604 | 600 to 600 C.T. | 1 to 1 C.T. | -10dBu |
| Z1670E | 50 to 50 | 1 to 1 C.T. | -10dBu |
| Z1671E | 50 to 100 | 1 to 1.4 C.T. | -10dBu |
| Z1672E | 50 to 200 | 1 to 2 C.T. | -10dBu |
| Z1673E | 50 to 600 | 1 to 3.46 C.T. | -10dBu |
| Z1675E | 75 to 75 | 1 to 1 C.T. | -10dBu |
| Z1676E | 75 to 150 | 1 to 1.4 C.T. | -10dBu |
| Z1677E | 75 to 300 | 1 to 2 C.T. | -10dBu |
| Z1678E | 75 to 600 | 1 to 2.8 C.T. | -10dBu |
| Z1680E | 150 to 150 | 1 to 1 C.T. | -10dBu |
| Z1681E | 150 to 300 | 1 to 1.4 C.T. | -10dBu |
| Z1682E | 150 to 600 | 1 to 2 C.T. | -10dBu |
| Z1685E | 600 to 600 | 1 to 1 C.T. | -10dBu |
| Z1686E | 600 to 900 | 1 to 1.22 C.T. | -10dBu |
| Z1687E | 600 to 1k2 | 1 to 1.41 C.T. | -10dBu |
| Z1688E | 600 to 2k4 | 1 to 2 C.T. | -10dBu |
| Z3001E | 600 to 600 | 1 to 1 | +2dBu @ 20Hz |
| Z30A11C | 150/600 to 600 /2k4 | 1+1 to 2+2 | +2dBu @ 20Hz |
| Z30A18C | 150 / 600 to 150 / 600 | 1+1 to 1+1 | 0dBu @ 20Hz |
| Z30A19C | 150 / 600 to 10k | 1+1 to 8 | +2dBu @ 20Hz |
| Z30A21C | 150 / 600 to 3k75 | 1+1 to 5 | 0dBu @ 20Hz |
| Z30A23C | 200 / 800 to 5k | 1+1 to 5 | 0dBu @ 20Hz |
| Z30A24C | 200 / 800 to 2k5 / 10k | 1+1 to 3.5+3.5 | 0dBu @ 20Hz |
| Z30A32C | 150 / 600 to 2k | 1+1 to 3.8 | 0dBu @ 20Hz |
| Z30A33C | 150 / 600 to 2k4 | 1+1 to 2 | 0dBu @ 20Hz |
| Z21805C | 500 / 1k | 1 to 0.5+2 | -10dBu |
| Z21808C | 150 to >6k | 1 to 6 | -10dBu |
| Z218A01C | 150 / 600 to 3.75 / 15 | 6.3+6.3 to 1+1 | 0dBu @ 30Hz |
| Z218A02C | 150 / 600 to 600 / 2k4 | 1+1 to 2+2 | 0dBu @ 30Hz |
| Z218A03C | 150 / 600 to 6k25 / 25k | 1+1 to 6.45+6.45 | 0dBu @ 30Hz |
| Z218A06C | 150 / 600 to 150 / 600 | 1+1 to 1+1 | 0dBu @ 30Hz |
