Julian, If the Ultimate U3 as you call it is part of the Ultimate series of transmitter kits from Hans Summers, then I believe the Yahoo Group that covers these kits is QRPLABS:
The group’s description says:
This group is for people who have bought or are interested in kits from QRSS Labs.
The range of available kits is at http://www.hanssummers.com/kits
Good luck with your kit.
Best 73’s, David
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