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| Part Number | 1650KP | 1650KA | 1650K | 1650KAP |
| Manufacturer | Hammond Manufacturing | Hammond Manufacturing | Hammond Manufacturing | Hammond Manufacturing |
| Series | 1600 | A | 1600 | 1650P |
| Packaging | Bulk | Box | Bulk | Bulk |
| Product Status | Obsolete | Active | Active | Active |
| Turns Ratio - Primary:Secondary | - | - | - | - |
| Impedance - Primary (Ohms) | 3.4kCT | 3.4kCT | 3.4kCT | - |
| Impedance - Secondary (Ohms) | 4, 8, 16 | 4, 8, 16 | 4, 8, 16 | - |
| DC Resistance (DCR) - Primary | - | 32.74Ohm, 36.71Ohm | - | - |
| DC Resistance (DCR) - Secondary | - | 306mOhm, 432mOhm, 540mOhm | - | - |
| Transformer Type | Push-Pull Potted, Ultra-Linear - Tube Output | Push-Pull Audiophile, Ultra-Linear - Tube Output | Push-Pull Audiophile, Ultra-Linear - Tube Output | Push-Pull Audiophile, Ultra-Linear - Tube Output |
| Frequency Range | 30Hz ~ 30kHz | 30Hz ~ 30kHz | 30Hz ~ 30kHz | - |
| Frequency Response | ±1dB | ±1dB | ±1dB | - |
| Voltage - Isolation | - | 2000V @ 1 Second | - | - |
| Insertion Loss | - | - | ±1dB | - |
| Return Loss | - | - | - | - |
| Power Level | 50W | 50W | 50W | - |
| Operating Temperature | - | - | - | - |
| Approval Agency | - | - | - | - |
| Mounting Type | Through Hole | Chassis Mount | Chassis Mount | Chassis Mount |
| Size / Dimension | 3.880" L x 3.310" W (98.55mm x 84.07mm) | 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) | 4.250" (107.95mm) | 3.810" (96.77mm) | 3.810" (96.77mm) | - |
| Termination Style | - | Wire Leads | Wire Leads | Wire Leads |
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