Simon,
Regarding your question pertaining to the number of copies in circulation of promo versus issued 12" singles, there is no way to know the precise number of either in circulation. If you check out
Disco Savvy: Quality Disco Music Albums - dance 1970s 1980s house 80's, you'll see thousands of 12" singles that were released as promos to DJs and radio stations, but not to the general public. However, the UK and other European countries did issue many of these promos as commercial 12" releases in their own country.
It is also impossible to know whether club DJs and radio stations stored their promos, sold them, or simply trashed them. It is possible that more promos were issued than commercial releases and vice versa. Generally speaking, when record companies issued promos to clubs and radio stations, they waited for feedback from the club DJs, and they also waited to see how the promos charted on record pool dance charts, before considering their commercial release. If the promo did not do well in clubs and on the radio, the record companies usually did not issue these promos commercially. Once again, in many instances, these were still issued commercially in the European markets.
Regarding promos that were issued commercially, it depends on how many copies were actually sold. It is possible that some songs sold poorly, so the number of promos definitely outnumbered commercial copies. The opposite could also occur. If the song sold very well, then the number of commercial copies would exceed the number of promos.
In buying a 12" record, those records or promos that were issued in a 45 rpm format usually had superior sound quality when compared to 33 1/3 rpm. The trick is to find a 12" copy in pristine condition. As stated above, if the 12" single was not stored properly, both promo and commercial releases could be of inferior quality. If you get lucky and find a clean copy, there is not much difference in sound quality of commercial versus promo releases, unless one is 45 rpm and the other is 33 1/3 rpm. One other exception to the rule is that some promo copies contained versions of songs otherwise not available commercially. And there are one more set of 12" singles issued that we haven't addressed, namely test pressings. And you thought this was an easy question...:icon_biggrin:
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