I am not sure if this one was made by motorola, then labeled sylvania  after they bought motorola in 2003, but i have never seen a ballast that powers this type of lamp, and im guessing all 3 are in series?
http://cgi.ebay.com/Sylvania-QTP3x40TT5-120-PSN-B-3-Lamp-TT5-120V-Ballast-/150446219641?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item23074b2179

Look like; with voltage mode heating.

Yep, that's a Motorola ballast for 40W single-ended twin tube T5
The old part # is M3-PN-TT5/40-B-120

The Motorola datasheet says "Series wired programmed rapid start lamp operation" and it has lamp EOL protection.