Cassette tape case1/18/2024 The coercivity of audio tapes varies from 350 Oe to 1200 Oe. Coercivity is a measure of the external magnetic flux required to magnetize the tape, and an indicator of the necessary bias level.Remanence of audio tapes, referred to quarter-inch tape width, varies from around 1100 G for basic ferric tapes to 3500 G for Type IV tapes advertised remanence of the 1986 JVC Type IV cassette reached 4800 G. Saturation remanence limits maximum output level and, indirectly, dynamic range of audio recordings.Two fundamental magnetic properties, relevant for audio recording, are: These require strong external magnetic fields to be magnetized, and retain substantial residual magnetization after the magnetizing field is removed. Magnetic recording relies on the use of hard ferrimagnetic or ferromagnetic materials. The values approach the limits of ferric tape technology Frequency response curves of a typical cassette tape showing the effects of different bias settings (after Roberson ) Magnetic properties MOL, SOL, bias noise and dynamic range marked on the wrapper of a superferric cassette (TDK AR, 1990s). By the end of the decade performance of the best Type I ferricobalt tapes (superferrics) approached that of Type IV tapes performance of entry-level Type I tapes gradually improved until the very end of compact cassette production. Metal particle tapes migrated to Type II and Type I, ferricobalt formulations migrated to Type I. Panasonic developed evaporated metal tapes that could be made to match any of the three IEC types. In the 1980s the lines between three types blurred. Double-layer Type III tape formulations, advanced by Sony and BASF in the 1970s, never gained substantial market presence. 'Type 0' was a non-standard designation for early compact cassettes that did not conform to IEC specification.īy the time the specifications were introduced, Type I included pure gamma ferric oxide formulations, Type II included ferricobalt and chromium(IV) oxide formulations, and Type IV included metal particle tapes-the best-performing, but also the most expensive. Specifications of each type were set in 1979 by the International Electrotechnical Commission (IEC): Type I (IEC I, 'ferric' or 'normal' tapes), Type II (IEC II, or 'chrome' tapes), Type III (IEC III, ferrichrome or ferrochrome), and Type IV (IEC IV, or 'metal' tapes). Top to bottom: Type I (and Type III), Type II, Type IVĪudio compact cassettes use magnetic tape of three major types which differ in fundamental magnetic properties, the level of bias applied during recording, and the optimal time constant of replay equalization. I would not feel comfortable here because of you look closely, the top sleeve is being forced open just a bit by the "rib", I feel like this would damage the sleeve, or worse, the card, over time.Standardized notches for automatic tape selection. This last view is what 20 sleeved (UltraPro Matte) cards look like in the case. If you zoom in, you can see the "ribs" in the upper right mentioned above. It's not enough for me to be concerned, but I don't think I'd be comfortable putting a 16th card, or any sleeve thicker than the UltraPro Mattes in them. It looks like the cards fit loosely, but the little "rib" in the upper right corner of this image puts the slightest pressure on them. So instead, I just printed the pack art, and cut it out to serve as a cover. The folds on the J card were hard to do on regular printer paper by hand, and the fit is so tight already. So, after some testing, I decided not do a full J card for each case. Doing this from mobile, so please forgive me. I am so stoked!!Įdit: here are some pics. I almost bought the Cubamajigs, but they were out of stock on the art I wanted and I really wanted to be able to customize the covers of the packs. I bought 64 of them (for both cubes I own) and it was around $50 shipped. They came today and they are perfect! I have 15, single-sleeved (in the cheap UltraPro sleeves) cards per case and there's still enough room to fit in home- printed "J-Cards" from the OG pack designs. Matthew Watkins' Ars Arcanum MTGO Cube AnalysisĪfter a year or so of searching, I found a Canadian company that sells them.Limited Resources (Cube Episodes: 59, 77, 213, 313)ģ-0 winning deck archive from the XMage Cube Group In Contention (Cube Episodes: 25, 31, 36, 71) Wtwlf's MTGS article on Cube Design Philosophy The Magic Show Episode #61 "Gleaming the Cube" Simple_Man's Cube Card of the Day Archive General ResourcesĬube Organization (no longer regularly updated) "It's like drafting hyperbole." - Evan ErwinĪ Cube is a custom draft set, typically designed to showcase the "best" cards ever printed in Magic, but sometimes with other thematic restrictions.
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