My True is a TDD-3CT. CT stands for club top, the 3 means it holds 3 half barrels of beer. So, a TDD-1 would hold one half barrel, no club top.
Go to the True website:
http://www.truemfg.com/Corporate/CorporateHome.asp
They have a seriel number inquirey that you can put the SN and find out how old it is. They should also have specs on it
Allan
__________________
Howlinowl Third World Brewing
Primary 1: Empty
Primary 2: Empty
Secondary 1: Empty
Secondary 2: Empty
On Deck:
On Tap 1: Yuengling Traditional Lager
On Tap 2: Kayumanggi Ale (pronounced "Kai-you-mang-ghe) Tagalog for "Brown"
Various bottles and cans: San Miguel Premium Lager, Flying Dog Mix Pack, Sierra Nevada Brown Ale