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| Part Number | 1650R | 1650RA | 1650RAP | 1650RP |
| Manufacturer | Hammond Manufacturing | Hammond Manufacturing | Hammond Manufacturing | Hammond Manufacturing |
| Series | 1600 | A | 1650P | 1600 |
| Packaging | Bulk | Box | Bulk | Bulk |
| Product Status | Active | Active | Active | Obsolete |
| Turns Ratio - Primary:Secondary | - | - | - | - |
| Impedance - Primary (Ohms) | 5kCT | 5kCT | - | 5k |
| Impedance - Secondary (Ohms) | 4, 8, 16 | 4, 8, 16 | - | 4, 8, 16 |
| DC Resistance (DCR) - Primary | - | 47.43Ohm, 54.65Ohm | - | 44Ohm, 98.5Ohm |
| DC Resistance (DCR) - Secondary | - | 232mOhm, 333mOhm, 343mOhm | - | 210mOhm, 344mOhm |
| Transformer Type | Push-Pull Audiophile, Ultra-Linear - Tube Output | Push-Pull Audiophile, Ultra-Linear - Tube Output | Push-Pull Audiophile, Ultra-Linear - Tube Output | Push-Pull Potted, Ultra-Linear - Tube Output |
| Frequency Range | 30Hz ~ 30kHz | 30Hz ~ 30kHz | - | 30Hz ~ 30kHz |
| Frequency Response | ±1dB | ±1dB | - | ±1dB |
| Voltage - Isolation | - | 3535VDC @ 1 Second | - | 2000V @ 1 Second |
| Insertion Loss | ±1dB | - | - | - |
| Return Loss | 1650R | - | - | - |
| Power Level | 100W | 100W | - | 100W |
| Operating Temperature | - | - | - | - |
| Approval Agency | - | - | - | - |
| Mounting Type | Chassis Mount | Chassis Mount | Chassis Mount | Through Hole |
| Size / Dimension | 4.250" L x 3.750" W (107.95mm x 95.25mm) | 4.250" L x 3.750" W (107.95mm x 95.25mm) | - | 5.000" L x 4.250" W (127.00mm x 107.95mm) |
| Height - Seated (Max) | 4.560" (115.82mm) | 4.560" (115.82mm) | - | 4.500" (114.30mm) |
| Termination Style | Wire Leads | Wire Leads | Wire Leads | - |
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