I found a couple of Russian sites which discuss the Convoys. Using Google Chome allows the choice of an English translation.
https://forum.qrz.ru/55-radiomuzei-i...noy-armii.html
In post 14 of the above is a link to a site which gets into discussing the convoys. The site seems to be gone, but can be found in the Internet Archives:
https://web.archive.org/web/20070406...murm/1942m.htm
If I am reading the pages correctly, it appears that some 61 "Locators GL-2" were sent in 1942. The first 6 arrived in Convoy 13.
Convoy Breakdown (Click on the Convoy number to get the actual ships in the convoy):
https://en.wikipedia.org/wiki/Arctic...ld_War_II#1942
https://en.wikipedia.org/wiki/Convoy_PQ_13