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| Part Number | 1650H | 1650HA |
| Manufacturer | Hammond Manufacturing | Hammond Manufacturing |
| Series | 1600 | A |
| Packaging | Bulk | Box |
| Product Status | Active | Active |
| Turns Ratio - Primary:Secondary | - | - |
| Impedance - Primary (Ohms) | 6.6kCT | 6.6kCT |
| Impedance - Secondary (Ohms) | 4, 8, 16 | 4, 8, 16 |
| DC Resistance (DCR) - Primary | - | 63.69Ohm, 71.33Ohm |
| DC Resistance (DCR) - Secondary | - | 74mOhm, 223mOhm, 258mOhm |
| Transformer Type | Push-Pull Audiophile, Ultra-Linear - Tube Output | Push-Pull Audiophile, Ultra-Linear - Tube Output |
| Frequency Range | 30Hz ~ 30kHz | 30Hz ~ 30kHz |
| Frequency Response | ±1dB | ±1dB |
| Voltage - Isolation | - | 2000V @ 1 Second |
| Insertion Loss | ±1dB | - |
| Return Loss | - | - |
| Power Level | 40W | 40W |
| Operating Temperature | - | - |
| Approval Agency | - | - |
| Mounting Type | Chassis Mount | Chassis Mount |
| Size / Dimension | 4.000" L x 3.130" W (101.60mm x 79.50mm) | 4.000" L x 3.130" W (101.60mm x 79.50mm) |
| Height - Seated (Max) | 3.810" (96.77mm) | 3.810" (96.77mm) |
| Termination Style | Wire Leads | Wire Leads |
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