11-02-2018, 07:25 PM
(11-02-2018, 06:30 PM)Terry Wrote: so what proportion of receivers sold in the late 70s would still be marked in metres?Quite a few looking at ITT as an example.
If you look at my collection of ITT radios mainly destined for the UK, http://www.kbmuseum.org.uk/itt_radios.htm then it seems that up to about 76 or 77 they were marked in metres, with one or 2 exceptions. Then from 78 onwards they were mostly dual marked in m and kHz.
The problem is it is difficult to be certain regarding the dates. I have tried to follow the same convention as The Radio Museum, using a ? to denote a date + or - one year, and ?? to denote the date is a best guess.
We need more information to come forward in the form of service information such as Trader sheets where they often mentioned the release date of each radio model.
The Radio Museum does not consider the dates on the manufacturers service documents to always be a very reliable source, because the radio may have been in development and testing for some time prior to its official release.
Personally, if the manufacturers service documents are dated, and ITT did not always date them in the latter days, then that date is good enough for me.
Mike
