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I propose to move this to Pioneer 6, 7, 8, and 9 and introduce the Oxford comma into the article text. NerdyNSK ( talk) 07:14, 31 August 2008 (UTC) reply

I don't know to what the TWT in the article refers. Please define it or link it to a definition. Thanks. 24.79.75.240 ( talk) 02:32, 13 August 2012 (UTC) reply

There's a link present, though it's easy to miss. Look at the first instance in the Time line and current status section. It refers to a type of vacuum tube ( Traveling-wave tube) that were used in some transmitters in that day. Dawnseeker2000 02:48, 13 August 2012 (UTC) reply