OSCILLATOR COIL
The bias oscillator should generate a sine-wave with negligible harmonic distortion to keep noise to a minimum. Symmetry in the waveform is essential. An unsymmetrical sine-wave has, in fact, a dc component made up of the difference between the positive and negative amplitudes of the sine-wave. This will introduce noise in the recording and impart some wasted remanence to the tape.
It is usual for the oscillator transistor to provide both bias and erase currents. In most of the commercial tape decks, the combined record-playback head is usually of high impedance, while the impedance of the erase head may be high or low. To accommodate low-impedance erase heads, a separate oscillator output, in the form of a secondary winding to ...
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