4WARRANTY_____________________________________The HF-2000 is warranted against defects in material and workmanship for a periodof two years for the original date of sale. This warranty does not cover the 3-500triode which carries a separate warranty issued buy its manufacturer. Please checkthe warranty card which comes with the tube. During the warranty period, QROTechnologies, Inc. will repair or replace the amplifier at our option if it is defective inany way in material and workmanship. The warranty does not cover any defectsresulting from improper use by the buyer or inadequate maintenance. In such casesthe repair will be billed at prevailing service rates.For warranty service or repair, the amplifier must be returned to the factory forauthorized service. The buyer shall prepay shipping and insurance charges, QROTechnologies, Inc. will pay shipping and insurance charges to return the amplifier tothe buyer. Please call the factory at 1-800-956-2721 for shipping instructions. Makesure when returning the amplifier you have insured the instrument for the fullreplacement cost. QRO Technologies, Inc. is not liable for any damage incurredduring return shipments.PROPRIETARY NOTICE_____________________________________This instruction manual, schematic diagrams, and technical data herein disclosed,are proprietary to QRO Technologies, Inc. and shall not, without express writtenpermission of QRO Technologies, Inc.. be used, in whole or part to solicit quotationsfrom a competitive source or used for manufacturing by anyone other than QROTechnologies, Inc. The information herein has been developed at private expense,and may only be used for operation and maintenance reference purposes or forpurposes of engineering evaluation and incorporation into technical specificationsand other documents which specify procurement of products from QROTechnologies, Inc. This amplifier is covered by copyrights both in the United Statesof America and throughout the world.