LL1635
Interstage Transformer
LL1635 is an interstage transformer for tube (valve) amplifiers available in Push-pull or Single-end versions.
The transformer is highly sectioned, and wound with a special low capacitance winding technique which results in very good frequency response. The transformer has a special high flux, low distortion audio C-core of our own production.
| Weight | Turns ratio | Static resistance, each primary | Static resistance, each secondary |
| 0.5 Kg | 1+1 : 1+1 | 500 Ω | 500 Ω |
| Type | LL1635/PP | LL1635/5mA | LL1635/20mA |
| Primary DC current, primaries in series ( for B0 = 0.9T) | 5 mA | 20 mA | |
| Maximum DC current before saturation, primaries in series | 9 mA | 35 mA | |
| Primary inductance (primaries in series) | > 300H | 130H | 30H |
| Frequency response, primaries in series (Source 4 kΩ for PP and 5mA, 2 kΩ for 20 mA. Load 68 pF) |
5 Hz - 60 kHz +/- 1 dB |
10 Hz - 60 kHz +/- 1 dB |
20 Hz - 75 kHz +/- 1 dB |
| Group delay @ 20 kHz (Source and load as above) | 0.5µs | 0.5µs | 0.5µs |
| Max. output voltage @ 30 Hz | 2x220 V peak (tot. 310Vrms) |
2x90 V peak (tot. 125Vrms) |
2x90 V peak (tot. 125Vrms) |
| Recommended max DC current through any primary section | 40mA | 40mA | 40mA |
| Isolation between primary and secondary windings / between windings and core |
4 kV / 2 kV | 4 kV / 2 kV | 4 kV / 2 kV |
