Speaking to Cnet, the source claims that both models will offer 16GB and 32GB editions, with the flat S1 coming in both Wi-Fi only and 3G + Wi-Fi models.
The Sony S1 will also offer an SD memory card reader, while the 9.4-inch display comes with TruBlack and Bravia technologies.
The source reckoned the battery life is "comparable to the iPad 2", and a range of accessories will be released for the S1 including a dock and a Bluetooth keyboard.
The Sony S2, Sony's weird, foldable cylinder tablet, is said to be available only in a 3G + Wi-Fi version.
As we reported when we got our eyes on the tablets for the first time, both the S1 and S2 will come with "the latest version of Android" (probably Honeycomb)
With the official product names yet to be revealed, the tech world is gearing up for Sony to launch both the S1 and S2 at or just before this year's IFA in early September.
If you're in the market for a tablet, our video guide to buying a tablet should help you sort the touchscreen wheat from the low-spec chaff:
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Former UK News Editor for TechRadar, it was a perpetual challenge among the TechRadar staff to send Kate (Twitter, Google+) a link to something interesting on the internet that she hasn't already seen. As TechRadar's News Editor (UK), she was constantly on the hunt for top news and intriguing stories to feed your gadget lust. Kate now enjoys life as a renowned music critic – her words can be found in the i Paper, Guardian, GQ, Metro, Evening Standard and Time Out, and she's also the author of 'Amy Winehouse', a biography of the soul star.