Hammond 807A Dynamic Mic to Base Audio Transformer, 7.5/30 Ohm
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Create Free Business AccountKey Features
- Dynamic mic or voice coil to base: 7.5/30 ohm primary to 600/2400 ohm secondary
- Max. primary D.C. unbalanced current: 1.6 mA
- +15 dBm maximum power level; +/- 0.5 dB from 50 Hz to 15 kHz
- Deep-drawn tin plated steel case with two 6-32 mounting studs and hardware
- Wire leads, 4" minimum length; 1.75" W x 1.25" D x 2.56" H max
- Humbucking construction with balanced split windings
- Electrostatic shield between primary and secondary
- RoHS and REACH compliant
The 807A is a broadcast-quality 800A Series audio transformer for coupling a dynamic microphone or voice coil into a transistor base input. It has a nominal 7.5/30 ohm primary and a 600/2400 ohm secondary, a lower secondary impedance than the grid-oriented 806A, suited to solid-state input stages.
Maximum primary D.C. unbalanced current is 1.6 mA. Frequency response is +/- 0.5 dB max. from 50 Hz to 15 kHz, insertion loss is approximately 1 dB, and the maximum power level is +15 dBm with the specified characteristics, or higher with reduced low frequency performance.
Humbucking construction helps reject stray magnetic fields, and balanced split windings on both primary and secondary give circuit versatility; the primary may be used as the secondary and vice versa for impedance matching. An electrostatic shield sits between the primary and secondary windings. It is housed in a deep-drawn steel case with a tin plated finish and fastens with two 6-32 mounting studs, supplied with hardware. Connections are made by wire leads of at least 4" in length. Maximum overall dimensions are 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high.
The 807A is RoHS and REACH compliant. Its listed shipping weight is 0.52 lbs (0.24 kg), and it is identified by UNSPSC 39121301.
Ideal For
- Dynamic microphone to transistor base input
- Voice coil to base coupling
- Solid-state preamplifier input stages
- Broadcast audio input circuits
Overview
| Series | 800A Series (Audio Broadcast Quality) |
| Application | Dynamic MIC or Voice Coil to Base |
| Product Type | Audio transformer, broadcast quality, with wire leads |
| Short Description | AUDIO TX B-CAST W/ LEADS |
Dimensions
| Overall Dimensions (Max) | 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high |
Electrical
| Impedance Note | Below nominal impedance, power capability is lower and the frequency spectrum shifts downward; at higher impedances both shift upward |
| Frequency Response | +/- 0.5 dB max. from 50 Hz to 15 kHz |
| Maximum Power Level | +15 dBm with specified characteristics (higher levels with reduced low frequency performance) |
| Primary Nominal Impedance | *7.5/30 ohms (* electrostatic shield between primary & secondary) |
| Secondary Nominal Impedance | 600/2400 ohms |
| Max. Primary DC Unbalanced Current | 1.6 mA |
Identifiers
| UPC | 623980607122 |
| UNSPSC | 39121301 |
| Part Number | 807A |
Packaging & Shipping
| Shipping Weight | 0.52 lbs (0.24 kg) |
| Series Shipping Weight (Spec Sheet) | 0.5 lb. (0.2 kg) |
Construction & Finish
| Case | Deep-drawn steel case, tin plated finish |
| Leads | Wire leads, minimum length 4" |
| Mounting | Two 6-32 mounting studs with hardware |
| Windings | Balanced split windings on primary & secondary; primary may be used as secondary and vice versa for impedance matching |
| Construction | Humbucking |
| Electrostatic Shield | Between primary & secondary |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What is the difference between the 807A and 806A?▾
Both have a 7.5/30 ohm primary; the 807A has a 600/2400 ohm secondary for base inputs, while the 806A has a 10K/40K ohm secondary for grid inputs.
What unbalanced DC can the 807A primary carry?▾
Up to 1.6 mA.
How is the 807A mounted?▾
The 807A has a deep-drawn tin plated steel case with two 6-32 mounting studs, and the mounting hardware is included. Connections are by wire leads with a minimum length of 4".
What is the frequency response of the 807A?▾
Frequency response is +/- 0.5 dB max. from 50 Hz to 15 kHz with approximately 1 dB insertion loss, at up to +15 dBm with the specified characteristics.
What are the dimensions of the 807A?▾
Overall dimensions are 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high max.
Is the 807A RoHS compliant?▾
Yes. The 807A is listed as RoHS compliant and REACH compliant.
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