Amp 2SC2922 and 2SA1216 (or 2SC3264 and 2SA1295) performance is very excellent more, it is good linearity, strong overload. Use it as a high-fidelity power amplifier stage amplifier, the performance is very excellent photos.
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Figure 2-30 for the use of the principle of the tube production of high-performance amplifier Figure o circuit consists of a differential input stage, stage differential voltage amplification level and to promote full and complementary push-pull amplifier output stage. In addition, this also has overload protection circuit and speaker protection circuitry. At the input, low-pass filtering by the clamor RI, c2, C3 composed of upper frequency limit the input of the circuit to reduce the transient state intermodulation distortion. VTl, VT2 constitute a differential input stage o VT3, VT4 constitute a differential voltage amplifier stage, VT4 collector output directly connected to the input A tube amplifier output VT70Vr5, VT6 composition of the current mirror, VT3 collector outputs VTs set a base connection input base VT6 pole after VT6 enlarge its collector output and the input amplifier output tube VT80 VT7, VTG, VT8, VTlo composite pipe consisting of complementary push-pull amplifier output stage. VT12, f) 4 and VT13, f Ga composition of output overload protection circuit. VT14 ~ VT16 composition speaker protection circuitry allows the speaker 5 seconds after the power is turned on access to avoid the boot impact. It can automatically cut off the speaker when the DC voltage exceeds the output of 1-5V. DC amplifier circuit due to the cancellation of the feedback capacitance slightly after the input differential stage feedback input to ground the DC bias resistance will wind "I RF &; RF, RF generally only about 1kfl. In order to strike a balance differential pair, a signal input resistance to ground J52 should also be reduced to the RF level. This will reduce the input resistance of the circuit a lot, and not easy to take a pre-stage was a good match. For this reason the general : Multi-voltage control amplifier circuit FET device as a differential input stage o The input stage circuit still use bipolar transistors, but the base bias resistor and the input resistor is provided separately (principle shown 1 35 (a)), to adjust the balance of the circuit by trimming potentiometer neither reduce the input resistance, but also to achieve the level of the differential circuit Qiao regulation, after all, a good solution. Because of the differential input is biased, so the input capacitance Cl not free to cancel o Another feature of the circuit is the use of suspension grounding. Suspension ground of the unit is in the ground portion input taken by the two regulator and a resistor R13, the negative supply it with isolation amplifier stage. So it can make the power supply circuit of the thermal noise generated by a large current channeling people not to enter the loop. On the other hand it can also inhibit the production of anti-speaker playback when the electric potential of channeling people to the input circuit to produce "Interface hum modulation distortion" (abbreviated as IHM distortion).
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