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| Image | ![]() |
| Part Number | 1645A |
| Manufacturer | Hammond Manufacturing |
| Series | A |
| Packaging | Box |
| Product Status | Active |
| Turns Ratio - Primary:Secondary | - |
| Impedance - Primary (Ohms) | 5kCT |
| Impedance - Secondary (Ohms) | 4, 8, 16, 70V |
| DC Resistance (DCR) - Primary | 72.11Ohm, 79.35Ohm |
| DC Resistance (DCR) - Secondary | 276mOhm, 391mOhm, 464mOhm, 9.304Ohm |
| Transformer Type | Push-Pull Audiophile, Ultra-Linear - Tube Output |
| Frequency Range | 30Hz ~ 30kHz |
| Frequency Response | ±1dB |
| Voltage - Isolation | 2000V @ 1 Second |
| Insertion Loss | - |
| Return Loss | - |
| Power Level | 30W |
| Operating Temperature | - |
| Approval Agency | - |
| Mounting Type | Chassis Mount |
| Size / Dimension | 3.750" L x 2.500" W (95.25mm x 63.50mm) |
| Height - Seated (Max) | 3.060" (77.72mm) |
| Termination Style | Wire Leads |
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