3CX800A7 Datasheet | Unknown Manufacturer

Easy DENTRON MLA- 2500 Conversion using SVETLANA 3CX400A7 3CX800A7 .. plement to Svetlana technote #44 Provided by sm2yer .. Fig 1 plement to Svetlana technote #44 Provided by sm2yer .. Photo A. Photo B. plement to Svetlana technote #44 Provided by sm2yer .. Fig 2. Fig 3. plement to Svetlana technote #44 Provided by sm2yer Technical Bulletin 44 Sida 1 av 6 No.44 Amateur Radio 3CX400A7 & 3CX800A7 .. The Easy MLA-2500 Conversion By: B-N. Bob Alper The MLA-2500 power amplifiers that are available for purchase have bee scarce since the articles for conversion to more popular tubes appeared in QST and munications Quarterly. Also, the 8875 tubes are in demand less and less because, except for amateur use, there is little industrial/mercial use for the tube. As the demand decreases, we can expect the price of a new 8875 to climb further from its present level, which is near $450. The MLA-2500 series is one of the most pact linear amplifiers of its power class. Its intermod performance at 1250 watts RF output, with 100 watts of drive to 8875 tubes, as measured by the ARRL (3rd and 5th order distortion products of 35 and 37 d B, respectively) is relatively good by the standards of modern amplifier designs . Therefore, it seems reasonable for MLA-2500 owners to try to find an alternate more economical and available replacement power tube. REPLACEMENT TUBE SOLUTION The 3CX400A7 and the 3CX800A7 are both candidates for consideration. Neither is nearly as economical as the tetrode tubes of previously published conversions. However, these tube types are both very similar to the original 8875. The 3CX400A7 is electrically identical to the 8875. Both the 3CX400A7 and the 3CX800A7 use the same socket, so this conversion is very easy. There is reasonable confidence that both tubes will be available for sometime in the future, as they are both used in numerous types of mercial, industrial, and medical equipment. The continuous and on-going use of these tubes will...