15.07.2024, 13:17
(Dieser Beitrag wurde zuletzt bearbeitet: 15.07.2024, 13:18 von Kirunavaara.)
Nice! Two different kinds of hubs in the two Memorex HBS II, yet probably both still made in USA. Will be interesting to see their shells - there are also different versions which sometimes look very similar to SKM, sometimes it's more obvious that they are different. Saft is probably a Magna. And the National Ångrom will be tricky to identify concerning who made which part.
Yes
Not sure, especially for the third one with 1980-82 labels. Around 1979/80, there was a modernisation of the tape which made it more stable against violining, the surface has a slightly different look. I don't know whether they only changed the binder composition, or also the pigments used. Late examples already have LH-D tape, but yours is from 1980, so probably not yet for that one. There are also ferro super LH with these late labels that were made in USA and have another different kind of tape, which corresponds to their performance I cassettes (before even those were loaded with LH-D from ca 1983).
I think we can be quite sure that all of these were cobalt doped, but I have never found any information about Pfizer pigments in "green LH", it has only ever been confirmed for "red LH". Now the first generation of fsLH I tape should be only in your two cassettes with the oldest labels (two indexing lines, C-120 and C-60). The other C-60 (second label version, four lines) from late 1979 probably has the intermediate generation of tape, as well as your examples from 1980 and 1981.
Usually, yes. The ones in ICM shells have German LH-D tape, the ones assembled by Genmag have Indonesian LH-D tape, which has a slightly darker colour and more shiny surface (and unfortunately a little less S/N and a higher risk for squealing).
There could be even more variations, I think Sebastian has a Colours of Sound with ICM shell and darker tape, which suspiciously looks like Ferro Super I (single layer Megadium)... but that was not the default tape used in these for sure :-)
Regards
Martin
Zitat:do I understand correctly, Pfizer here?:
https://ez647.sk/cc/basf_lhsuper.html
Yes
Zitat:https://ez647.sk/cc/basf_fslh.html
Not sure, especially for the third one with 1980-82 labels. Around 1979/80, there was a modernisation of the tape which made it more stable against violining, the surface has a slightly different look. I don't know whether they only changed the binder composition, or also the pigments used. Late examples already have LH-D tape, but yours is from 1980, so probably not yet for that one. There are also ferro super LH with these late labels that were made in USA and have another different kind of tape, which corresponds to their performance I cassettes (before even those were loaded with LH-D from ca 1983).
Zitat:Pfizer here is doped with cobalt? for all versions pictured? The latest one I have there is the 1981 version.
https://ez647.sk/cc/basf_fslhi.html
I think we can be quite sure that all of these were cobalt doped, but I have never found any information about Pfizer pigments in "green LH", it has only ever been confirmed for "red LH". Now the first generation of fsLH I tape should be only in your two cassettes with the oldest labels (two indexing lines, C-120 and C-60). The other C-60 (second label version, four lines) from late 1979 probably has the intermediate generation of tape, as well as your examples from 1980 and 1981.
Zitat:So The Colours of Sound uses modern Ferro Extra tape in both the GMS and ICM versions?
Usually, yes. The ones in ICM shells have German LH-D tape, the ones assembled by Genmag have Indonesian LH-D tape, which has a slightly darker colour and more shiny surface (and unfortunately a little less S/N and a higher risk for squealing).
There could be even more variations, I think Sebastian has a Colours of Sound with ICM shell and darker tape, which suspiciously looks like Ferro Super I (single layer Megadium)... but that was not the default tape used in these for sure :-)
Regards
Martin