Is there such a difference between the single ended pre amp and the post amp push pull?

The bile machine refers to the power amplifier made of tube circuits.

Preamp refers to voltage amplification in the traditional sense, due to the small signal output of different sound sources, voltage amplification is required, and the preamp circuit is added before power amplification for signal voltage amplification. The post-amp is mainly power amplification, which can also be simply understood as current amplification. Used to drive the speaker.

In the push-pull amplification circuit, because at least two output tubes are used to amplify the positive and negative half cycles of the signal respectively, the inverted circuit must be designed in the circuit to assign the power output tube to the appropriate corresponding signal, so as to meet the basic working conditions of the push-pull amplification circuit. In the push-pull amplifier circuit, it cannot be coupled to the output cow output terminal. Therefore, the signal-to-noise ratio of this circuit is relatively good.

At the same time, because the push-pull output transformer does not have DC magnetization, the output transformer can be made in the same way as the power transformer by cross-stacking silicon steel sheets, so that it can be relatively single-ended amplification, reduce the volume of the output cow, and reduce the cost.

The power output circuit of single-ended amplification is lower than that of push-pull amplification circuit in terms of efficiency, but the circuit is much simpler than that of push-pull circuit, and the components used are relatively few, and the failure rate is much lower than that of push-pull amplification circuit. Since the single-ended amplifier circuit does not have the link of inverted circuit, the signal goes directly to the input stage of the final power amplifier tube, so there is no trouble of inverted circuit.

If it is used in a home environment, a single-ended tank machine is sufficient. In terms of power, the general living room can not use too much power, otherwise there will be opinions upstairs and downstairs; In terms of timbre, because the push and pull is the two pipes, the front and side are amplified separately, which is easy to produce crossover distortion. And there are many excellent single-ended bile machines to choose from.

In terms of the output advantage of the power amplifier, of course, the push-pull bile machine is good. In the amplifier, there are a variety of power outputs, and its single-ended amplifier output is a typical Class A amplifier circuit, which is also one of the most widely used representatives. In the sixties and seventies, most of the tube radios were single-ended machines.

The single-ended bile machine circuit is simple and the sound quality is also relatively good, the pure post-stage single-ended bile machine, this circuit is also used in many ways, the most common power amplifier tube is 6P P V L6 tube, etc., as a power output tube. Generally, half of the tube such as 6N N1 is used for voltage amplification and wave pickup, and the other half is used for pushing. If you want the distortion rate to be smaller, and the output power is multiplied, the sound quality is good, especially the bass is more vigorous and beautiful, that is, to take the push-pull output circuit, the disadvantage is that the cost is high, but the output power is large and the sound is loud, and the crossover distortion is small, so the bile power amplifier circuit has been widely used.