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The Philips Compact Cassette . . . continued from page 33
selected “normal” 120µs (ie, a standard ferric
oxide) tape. I found some “junk box” tapes
to be pretty awful.
The record level meter is reliable, with an
acceptable 3% distortion level corresponding to the centre of the red zone. Speed constancy is specified in two ways: wow (slow
variations up to 5Hz), and flutter (variations
from 5Hz to 30Hz). Wow measured at 0.3%,
flutter at 0.4%. I expected better and suspect variations in holdback tension as the
main cause.
There was also a definite “flanging” effect
(for anyone who remembers “Itchycoo Park”)
siliconchip.com.au
that’s consistent with tape slewing across the
playback head. Playback speed was constant
down to a supply voltage of 4.7V.
EL3302 versions
There are the preceding EL3300/
3301, distinguished mainly by a white plastic
operation lever, and the following EL3303.
Several variants of the EL3302 were produced around the world. The basic mechanism
was widely re-badged by European (Telefunken,
Siera), US (Norelco, Mercury, Wollensak) and
Japanese (Panasonic) manufacturers, among
others.
Australia’s electronics magazine
Further reading
For the EL3302, see: www.petervis.com/
Cassette_Tape_Recorders/ and look for the
EL3302 – as well as the user manual, Peter
has an extensive description complete with
great photos.
For general references, see: en.wikipedia.
org/wiki/Compact_Cassette
For a more complete discussion, see:
siliconchip.com.au/link/aaj2
On bias, (a quick summary), see:
siliconchip.com.au/link/aaj3
For a detailed discussion of bias, see:
www.hccc.org.uk/acbias.html
SC
July 2018 103
