The Sony TCA-11 test cassette with cable was inserted on a Tascam Porta 03.
The signal was taken directly (with cable alligator clips) from the Tascam head (the head not disconnected from Tascam).
The Sony cassette was connected to the Sony CD player Walkman. The Constant Craving - K D Lang song was played on CD and it did not sound nice as expected. No bass, no treble. This is the signal coming out of a cassette playback head when tape runs as slow before EQ been applied.
Signal path, setup.
Constant Craving - K D Lang on CD - Sony Walkman CD line out - Sony TCA-11 car cassette adaptor - Canford 1:14 step up transformer with 400mH primary inductance - Pleiades V4 prepreamp operating at 4.8V - Realistic disco mixer mic input
Then a test CD was played with sinewaves at various frequencies.
Watching the VU meter in the Realistic mixer after adjusting gain for 0VU at 1KHz...
There was no apparent movement of the needle at 20Hz. Movement was apparent above 100Hz.
The responce was still increasing up to 1 KHz.
Then after 4KHz it was dropping again.
About 10 dB drop at 20KHz.
It is interesting in the above experiments that the cassette heads do not have to touch when kissing each other. Even at a distance of several millimeters there is magnetic signal coupling but at a low
level. Even before they would touch the signal was almost identical to the full touch condition of the play button fully pressed and engaged.
Reference:
http://www.extra.research.philips.com/hera/people/aarts/_Philips%20Bound%20Archive/PTechReview/PTechReview-31-1970-077.pdf
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