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— in accordance with the name, such models combine both types of elements — transistors and radio tubes. They are usually integrated amplifiers, where tubes are used in the pre-amp circuit and transistors are used in the power amplifier. This reduces the weight, size and cost of the device compared to all-tube models, while maintaining the characteristic "warm" sound. At the same time, we recall that such a sound has a high level of distortion; for details, see p. "Lamp".