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his JJ 828 is Brand NEw and never used
JJ828 is an integrated power tube stereo amplifier with an independent power supply for each channel.
The beam tetrode KT88 with an anode dissipation of 35 W has been selected as an output tube for this amp.
The choice of output circuitry is the result of compromise between output power, distortion and damping factor. Two KT88 used as a pentode in class B can deliver 120W, or, on the other hand, when used as a triode in class A, 22 W. We have decided on ultra linear circuitry using four KT88 with cathodes feedback.
The output power of 70 W per channel may seem to be low but it is justified in accomplishing the final outcome. When the KT88 current is 70mA and Ub= 420V (Pa ~30W), a distortion of approximately 1% is achieved at full power without any feedback. For comparison, distortion at Ia=40mA is about 5%. Introduction of feedback of 10DB (3X) sets the output impedance to a satisfactory low level.
| Actualizado:
Miércoles, 4 Noviembre 12:25 |
Referencia Habitamos:
4698501 |
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