Qualstar Corp. missed analyst earnings’ estimates in the third quarter. The Simi Valley maker of magnetic data-storage tape and power-supply systems reported a net loss of $3.3 million (27 cents a share) for the quarter ended March 31, compared with a net loss of $553,000 (5 cents) in the same period a year earlier. Revenue decreased 36 percent to $3 million. Analysts on average had expected a loss of 9 cents on revenue of $3.82 million, according to Thomson Financial Network. Shares in Qualstar closed up 5 cents, or 2.5 percent, to $2.03 on the Nasdaq. Delays in shipments of semiconductor testing equipment contributed to mixed results in the fiscal third quarter for Trio-Tech International Inc. The Van Nuys semiconductor testing and services firm reported a net loss of $543,000 (16 cents a share) for the quarter ended March 31, compared with a net loss of $518,000 (16 cents) in the same period a year earlier. Revenue decreased 13 percent to $6.5 million. Shares lost 11 cents, or about 5 percent, to close at $2.12 on the New York Stock Exchange.