Sole source justification: We have found only two companies capable of rebuilding the very large L3403 klystrons. Litton, the orignal manufacturer of the tube quoted us $200,000. Californa Tube Lab quoted us $65,000. Delivery from Litton would be in January 2001 while CTL would deliver 8-12 weeks after receipt of order. Both quotes are attached.

To: Jim Martin, CTL fax 408 761 1492

From: Jon Hagen, Cornell University - Arecibo Observatory FAX 787 817 2740

Date: 11-18-99

Jim: It seems we need to have your formal quote addressed to our purchasing agent:

Jose' Martinez, Purchasing Agent

Arecibo Observatory

Could you therefore fax me the quote again, addressed to Jose' Martinez. Make the quote as before except please include the two paragraphs below (which I think you've already seen, talking to John Foster of MIT). We hope to get this order out to you right away.

Sincerely, Jon Hagen

_________________________________________________________________

Acceptance testing: Cornell University is to be responsible for acceptance

testing of the rebuilt Litton 3403 klystron using the 430 MHz transmitter

of the Arecibo Observatory. Acceptance by Cornell of the klystron will be based

on successful completion of 24 hrs of full power operation and five complete

thermal cycles. Acceptance testing will be completed within 45 days of

receipt of the rebuilt klystron at the Arecibo Observatory.

Warranty provisions: The rebuilt 3403 klystron will carry the same warranty as when new:

12 months after acceptance by Cornell University or 750 hours of beam time after acceptance, whichever occurs first.