LL1620
Tube Amplifier Output Transformer
The transformers are highly sectioned with harmonically sized sections, which results in a minimum leakage inductance. This, combined with a low capacitance coil winding technique results in a wide frequency range.
LL1620 transformers have a special audio C-core of our own production, which is gapped for desired DC current. The transformers are of open frame type suitable for mounting inside an amplifier housing.
| Pin Spacing Module : | Weight : | Dimensions (Max. L x W x H above PCB) |
| 5.08mm (0.2") | 2.5 kg | 118 x 85 x 78 mm |
| Turns ratio : | 4 x 19.5 : 8 x 1 | |
| Static resistance of primary (all in series) : | 308 Ω (4‧77 Ω) | |
| Static resistance of each secondary (average) : | 0.4 Ω | |
| Primary leakage inductance (all in series) : | 11 mH | |
| Max. recommended primary DC current (heat dissip. 7W) | 150 mA | |
| Max. primary signal voltage r.m.s. at 30 Hz (all in series) | Push-Pull : 860V | Single End : 380V |
| Isolation between primary and secondary /between windings and core | 3kV / 1.5kV | |
| Frequency response (Ref : 0 dBu, 1kHz) | 7 Hz~25 kHz ±0.5dB | |
| Standard types : | LL1620 / PP LL1620 / 40mA LL1620 / 60mA LL1620 / 80mA |
|
| Phase Shift : | @ 20 Hz 2° | @ 20 kHz 13.5° |
| Group delay (δφ/δω) | @ 20 kHz 2.2 μs | |
| Secondary connection for 4/8/16 Ω | Core Airgap (Delta/2) | |||||
| -/B/C | B/C/D | C/D/E | 25 μ (Push-Pull) |
125 μ (Single Ended) |
190 μ (Single Ended) |
250 μ (Single Ended) |
| Primary Load Impedance (transformer copper resistance included) |
DC current for 0.9 Tesla (rec. operating point) Primary Inductance |
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| 11.5 kΩ | 6.0 kΩ | 3.3 kΩ | Push-Pull 300 H |
40 mA 90 H |
60 mA 60 H |
80 mA 45 H |
| Output Power and Loss | ||||||
| 62W | 125W | 250W | Max. Power, Push-Pull at 30 Hz | |||
| 13W | 25W | 50W | Max. Power, Single Ended at 30 Hz | |||
| 0.2 dB | 0.5 dB | 0.8 dB | Loss across transformer | |||
Associated downloads
