史上最全的三类带（IEC III / TYPE III）汇总

david-ease

普通卡座使用的盒式空白磁带，分TYPE I，TYPE II，TYPE III，TYPE IV，一共四类。相对常见且常用的一类带、二类带、四类来说，三类带就少见得多了。三类带由于存在的时间较短，而在性能、价格方面又没有优势，当年没用像一类二类带那样得到市场的认可，故三类带的品种并不多。
大致数了一下，目前发现的三类带不到40种，这在拥有几千个品种的磁带大家族中，实在是微不足道。
发行过三类带的品牌，主要有SONY，BASF，DENON，Scotch，AGFA，PHILIPS，SANYO，GRUNDIG。
从二楼开始，分享一些我早前收集到的三类带照片。这些照片，有一些是朋友的磁带收藏，拍照发给我的，有一些是从agfabasf.com等知名的网站上下的，有一些是从网上看到时随手保存下来的。
这个帖子应该是全宇宙最全的盒式空白三类带汇总贴了，保证比任何地方看到的三类带种类都齐全，不信的话，你可以尝试补充下面还没有出现过的三类带照片

david-ease

交易区新帖推荐

先发天龙的三类带。
DENON的三类带只有三款，分别是46分钟，60分钟，90分钟。

david-ease

摘录维基百科上对三类带的介绍：

Type III tapes

Ferrichrome tapes

In 1973 Sony introduced double-layer ferrichrome tapes, having a five-micron ferric base coated with one micron of CrO2 pigment.[70][50] The new cassettes were advertized as 'the best of both worlds' - combining good low-frequency MOL of microferric tapes with good treble performance of chrome tapes.[40][20] The novelty became part of the IEC standard, codenamed Type III; the Sony CS301 formulation became the IEC reference.[21] However, the idea failed to attract followers. Apart from Sony, only BASF and Agfa introduced their own ferrichrome cassettes.[71]

These expensive tapes never gained substantial market share, and after the release of metal tapes they lost their perceived exclusivity.[50][40] Their place in the market was taken over by superior and less expensive ferricobalt formulations.[50][40] By 1983, tape deck manufacturers stopped providing Type III recording option.[21] Ferrichrome tape remained in BASF and Sony lineups until 1984[71] and 1988[72] respectively.

The use of ferrichrome tapes was complicated by conflicting rationale of the playback of these tapes. Officially: they were intended to be played back using 70 μs equalisation. The information leaflet that Sony included in each box of the ferrichrome cassette recommended that, "If the selector has two positions, NORMAL and CrO2, set it to the NORMAL position."[73] (which applies 120 μs equalisation). The leaflet notes that the high frequency range will be enhanced and that the tone control should be adjusted to compensate. The same leaflet recommends that if the playback machine offers a 'Fe-Cr' selection, that this should be selected. On Sony's machines, this automatically selects 70 μs equalisation.[74] Neither Sony nor BASF cassettes feature the notches on the back surface that automatically selects 70 μs equalisation on those machines that featured an automatic detection system.

david-ease

音响盟主

给楼主无情打击一下，这个3类带有么？

david-ease

交易区新帖推荐

音响盟主 发表于 2023-1-2 11:09
给楼主无情打击一下，这个3类带有么？

这款三类带的照片我有的，不但有90分钟的版本，还有46分钟 60分钟的版本，你见过吗？哈哈

音响盟主

再来2个

david-ease

再发张少见的三类带镇镇场，这是论坛上低温老师的三类带，很罕见的

david-ease

音响盟主 发表于 2023-1-2 11:40
再来2个

这两个确实没有见过，第一次见，盟主不愧为盟主，
厉害厉害！

oldwalkman

罕见

david-ease

音响盟主 发表于 2023-1-2 11:40
再来2个

上面这张JEWELTONE是哪里的品牌？这张像DIY山寨的作品。

david-ease

Scotch的，也有46、60、90分钟的不同版本













再补充几张agfabasf.com下载的scotch三类带照片

david-ease

BASF的三类带，也有46、60、90分钟的不同版本











vintagecassettes上不同包装版本的BASF三类带：

音响盟主

david-ease 发表于 2023-1-2 12:02
上面这张JEWELTONE是哪里的品牌？这张像DIY山寨的作品。

玩LP,玩唱头的肯定知道这牌子的

david-ease

PHILIPS推出过2款三类带，都是60分钟的版本





咸鱼上的实物照片：