Simple 100W power amplifier circuit

The power amplifier circuit composed of pLPC1342V and NE's famous fever tubes 2SC2987A and 2SA1227A has a
maximum output power of up to 120W and a cut-off frequency of 500MHZ. Its collector output current can reach 12Ao.
The circuit is shown in Figure 2-126 As can be seen from the circle shown in o
    , the output stage of this circuit uses two tubes for parallel output, with the purpose of increasing the output power. The working
voltage of the circuit is ±45V. Increasing the working voltage can increase the output power, but the tube consumption of the power amplifier tube and The amount of heat generated is also increasing,
so to meet the needs of output power, the power supply voltage should be reduced as much as possible. For
the power amplifier circuit composed of 2SC2987A/2SA1227A, the power supply of the final stage should not exceed ±45Vo. The front-stage ppC1342V can be used with The final stage shares a
set of power supplies, or a separate set of power supplies can be used. When the front and rear stages are powered separately, the front stage can also use a regulated power supply.
When the front and rear stages share a set of power supplies, a and b, c and d in the figure can be Just connect them together. Table 2-35 lists the power amplifier circuit
composed of ℃1342V, 2SC2987A, and 2SA1227A when used. In the test of this circuit under different power supply voltages and different power supply forms, it was found that it has excellent frequency response characteristics , when outputting 1w power on 8.(1 load, the signal source frequency changes from 10H to 100kHt, and the curve characteristic base rate has no transition; when fo is at 400kHz, the curve drops by 2d30. The fidelity of the machine is also very ideal. When the output power is low, lkHz: harmonic distortion of the signal ≤ 0.012%, harmonic distortion of the 100HZ signal ≤ 0.008%, harmonic distortion of the 100kHz signal ≤ 0.005%o