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Interstage Transformers
One of the most difficult transformers to design is the interstage transformer, because of its unique features. Here, to get a good result, the source should be a good winder. A high current can overcome the interwinding capacitance such a transformer will present. One possible way of making things work satisfactorily is to generate twice as much gain in the driver stage and stepping down the gain to half in the interstage. This reduces all of the inherent design constraints imposed by a transformer.
General Functions of Interstage Transformers
The basic function of any interstage transformer is to provide signal ground isolation from stage to stage. The actual function covers larger dimensions. These transformers couple AC without the passage of DC. It allows a vacuum tube circuit to couple signal from source to load or to another stage with a minimum of loss, thus maintaining the signal integrity at the highest level. They can balance and unbalance the signals, and they can transform signal levels and signal impedances
Transformation of Impedence
One of the main Interstage transformer's functions is to transform the impedance of a signal in between two stages of a tube, or when a conversion between differential and single-ended signals is needed. These conversions can be made using active stages. This, however, was not economically viable before the introduction of transistors. Circuits relied on vacuum tubes. The cost of several tube envelopes was high, and no possible substitutes for these envelopes were available. Today however, there exists a provision to use discrete transistors or dual-triode tubes, which solves the problem.
Achieving Less Phase Voltage Variance
Another important function of Interstage transformers used as plate feed for tube limiters is to achieve lesser plate voltage variance between non-compression and compression. They are thus considered to have the same advantages chokes have over plate resistors, and they also greatly reduce the quantity of thump transmitted to the amplifier stage. Along with these functions there are numerous other functions that an interstage transformer performs without any hassles.
An Overview
Common types of interstage transformers include phase splitting, single-ended and push-pull type. The basic reason why interstage transformers are not commonly used today is the cost of manufacturing them. At present, there is a huge variety of new electronic components that can pave way for a design of a circuit with an interstage transformer. Primary current, primary impedance and secondary impedance are the concerns to be kept in mind at the time of ordering an interstage transformer.