When did the ARRL ignore SSB? In the 1930s, the ARRL had an article on SSB in QST, and it is mentioned in "200 Meters And Down" (pages 180 and 181). However, given the state of the amateur radio art in the mid-1930s, SSB was simply not an alternative. Then came WW2. Soon after the war ended, the ARRL began pushing SSB in a big way. Starting in the January 1948 issue of QST, there was article after article on SSB, explaining the theory, extolling the virtues, and showing how to do it. A regular column, "On The Air With Single Sideband", ran from 1948 to 1954. "Single Sideband For The Radio Amateur", which was mostly reprints of QST articles, first appeared in 1954. In fact, starting in 1948, the ARRL paid so much attention to SSB that some members complained that ARRL was "forcing SSB down our throats". If by "affordable" you mean "manufactured/kit equipment that cost about the same as AM gear for similar power", then, yes, it was the 1960s. But for the homebrewer, SSB was "affordable" very early on. The problem was, SSB wasn't as simple or as easy to use as AM. That is....until SSB transceivers such as mentioned above began to appear. That changed the game. Here's an example: In the late 1950s, Heathkit sold the RX-1/TX-1 pair (Mohawk/Apache) for about $550 (plus shipping for about 150 pounds in 2 packages, if driving to Benton Harbor wasn't practical). What you got once the RX-1/TX-1 were built was a nice 100-watt-class AM station for 80 through 10 (pre-WARC) that was also pretty good on CW. It could receive SSB, too. (The RX-1 could receive 160 but the TX-1 could not transmit on that band!) For another $90 or so you could add the SB-10 SSB adapter to the TX-1 and transmit on SSB. Better have a nice big STURDY desk to put them on, and a source of 110 AC good for about 600 watts peak. Mobile? Not unless you have a vehicle with a lot of room and an AC generator. And - they don't transceive, you have to zero beat. Now fast forward less than 10 years to 1967. Heathkit is selling the SB-101 transceiver for $370. With power supply, about $400, add a CW filter for another $25 or so. Say $425 plus shipping for maybe 40 pounds. Once built, you've got a nice 100-watt-class SSB/CW station for 80 through 10 (pre-WARC) It won't do AM, but it's easier to use than the TX-1/RX-1 combo, it transceives, and it's small and light enough for mobile use with the DC supply (another kit, cost $50 or so). You could put the SB-101 on a card table with no problems. Any wonder SSB transceivers pushed AM separates aside in the 1960s?