[mitajohn]

The Sony TC-K555ES deck is equipped with a similar head block.

As mentioned in it's Service Manual on page #2:

Three-head system
Separate record and playback heads allow optimum gap settings
and impedance ratings for distortion-free recording and greatly extended
frequency response. For good tape·to-head contact the
heads are mounted in one block and each head is separately adjusted
for precise azimuth alignment. The three-head system also
enables you to monitor the recorded tape while actually recording.