TDK MA-60 Metal Type Cassette Tape
“Type IV” tapes using pure metal particles (as opposed to
oxide formulations) were introduced in 1979 by 3M under
the trade name Metafine.
The metal-formulated audio cassette hit the scene as the
answer to a number of problems with previous tape
formulations. The standard Ferric-oxide (Type I) tape had
typically rendered poor high frequency definition.
Two subsequent solutions had been developed: the first
(Type Il) being a chrome (CrO2) Formulation, which rendered
much better frequency reproduction and very low noise
(hiss) at the expense of some output level and low-frequency
solidity. The second solution, ferro-chrome (Type II), was an
attempt to restore some low-frequency firmness to the
bright and airy sound of chrome, by adding a second coating
layer (ferric) to the existing chrome formulation. Fundamentally,
it was a technically imperfect innovation, and it wasn’t
significant enough an improvement over standard chrome.
Enter the Type IV tape, with a completely new formulation,
of metal particles. The advantages were quickly recognized.
This was a very hard-wearing tape, which could take much
higher sound levels than a chrome, whilst reproducing equal
or better high frequency definition, and a firmer bass — but,
without losing the spacious midrange in the way Ferro-
The disadvantages were quickly recognized too;
excess wear on the tape heads, and excess cost in the
retail price being the most significant. In order to get 20%
better sound, you have to spend 80% more.
The metal audio tape was, however, considered worth
persevering with. Efforts were made to solve the problem
of wear, and in the course of the early 1980s the Type IV
cassette did start to catch on.
By the mid 1980s, metal tapes had been adopted by a lot
of enthusiasts, but they remained too expensive to be bought in
bulk by the average consumer.
Metal cassettes (IEC Type IV) also use 70 µs equalization.SKU: n/a
TDK MA-X60 Metal Type Cassette Tape
TDK MA-X – Superior dynamic range and music handling
power from TDK’s ultra-fine Finavinx metal formulation.
Ideal for high-end raks systems.
Super Precision Anti-Resonance Cassette Mechanism II reduces
modulation noise and improves stereo imaging for enhanced
SUPER PREClSION ANTI-RESONANCE CASSETTE MECHANlSM II
TDK’s SP-ARII is entirely constructed of two complementary
layers of plastics in a uniﬁed combination that reduces resonance
for very low modulation noise and increases rigidity.
ST liner sheets and micron precision parts provide superior
tape handling and reliability for further enhancing sound quality.
First appearance in 1985.
Last edition in 1992.SKU: n/a
TDK SA-90 SUPER AVILYN Chrome CrO2 Cassette Type II
TDK SA – State-of-the-art Super Avilyn high bias formulation. Delivers unsurpassed performance. High MOL and wide dynamic range.
SA’s advanced cobalt-adsorbed gamma-ferric oxide particle formulation made it the first non-chrome high bias cassette.
High fidelity cassette tape takes a big step nearer perfection with TDK’s revolutionary new Super Avilyn (SA). The special ultra-refined Super Avilyn magnetic particle can be more densely and evenly packed onto the tape surface for an improved power-packed performance on any cassette deck with high bias (Type II) position. It’s wider frequency range, lower noise levels and greater maximum output are all achieved with no more head wear than that of normal ferric oxide tape and drastically less than that of CrO2.
Super Avilyn has excellent response in the low and middle frequencies and equals the response of chrome tapes in the high frequencies. It is compatible with all high quality tape machines currently available; where these are fitted with a chrome bias switch, it should be used for optimum results.
SA is also housed in an improved Laboratory Standard Cassette Mechanism; many parts of this super-precision mechanism, such as its double hub clamp and bubble liner sheet have yet to be equalled. This improvement has created a highly precise and stronger mechanism, which effectively reduces any structural warpage and virtually eliminates wow and flutter. Tape to head alignment is also improved, so tape transport is smoother.
First appearance in 1974SKU: n/a