The gallstone mixer introduced in this paper has the advantages of small distortion, good high frequency response, high conversion rate and large dynamic range due to the use of high frequency double triode 6N3 for audio amplification.
The power output stage uses the Japanese Sanken company's audio name tube SAP15N/P, which are two complementary Darlington pairs with internal biasing diodes. This tube, also known as a high speed thermal reaction transistor, a TRAITR tube, has high thermal stability. The structure of SAP15N/P is shown in Figure 1.
The circuit of this machine is shown in Figure 2.
The power output stage circuit is a typical OCL, and uses constant current drive. The second pin of SAP15N and the fourth pin of SAP15P are indirectly connected with a 510Ω potentiometer to adjust the bias voltage to adjust the quiescent current of the power amplifier stage. The quiescent current of this circuit is 100mA. The tube front stage and the transistor post stage are capacitively coupled.
The front stage uses two 6N3 as voltage amplification and power drive stages, and is connected to the SRPP circuit. In order to improve the performance of the amplifier, the machine adds a small loop negative feedback.
The power supply is powered by two transformers. One transformer has a capacity of 20W, an output of 200V DC, and an AC 6.3V for four 6N3 tubes. The transformer can be a C or E core. The other transformer should have a capacity greater than 300W and an output DC voltage of ±45V to supply power to the transistor amplifier stage.
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