This is a market research source sought notice for the procurement of an Electron Tube (NSN 5960-00-230-8366), not a request for quote or proposal, and no solicitation is currently being issued. A firm fixed-price contract is anticipated for a quantity of 897 each, with price breaks requested from 200 to 1,300 units. The item is a Qualified Parts List (QPL) item, and any alternate offeror must provide a complete data package for evaluation. The purpose is to identify parties interested in becoming approved sources. Interested parties should send a letter of interest with company details to the contracting officer.