Great find BS, nothing wrong with your memory, look after that scrap of paper. This maybe explains why the 130s never got to the UK. 80 degs F was never heard of back in the 1960s !!!!!! 70-75 was a hot summers day !!
We get 80+ now
but I think the temperature reference was Rockford's covering their backsides in case of overheating problems.
This was shown in a Rockford Service letter, BSG-0062, dated 10-1-67, which stated the 140s were for break-in only and a set of substitute 130s were packed with the tool kit after Ser No. 16T1646. No mention of 80 deg F !! It also says with the 130s , the float level was 15/16'' and the needle jet clip should be in the second from bottom position. Where did all those 130 jets go ?