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PDF 3CX800A7 Data sheet ( Hoja de datos )
| Número de pieza | 3CX800A7 | |
| Descripción | 3CX400A7 / 3CX800A7 | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 3CX800A7 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Easy DENTRON MLA–2500 Conversion using SVETLANA
3CX400A7
3CX800A7
www.DataSheet4U.com
Complement to Svetlana technote #44
Provided by sm2yer
1 page  
Technical Bulletin 44
Sida 1 av 6
No.44
Amateur Radio
3CX400A7 & 3CX800A7
www.DataSheet4U.com
The Easy MLA-2500 Conversion
By: B-N. Bob Alper
The MLA-2500 power amplifiers that are available for purchase have become
scarce since the articles for conversion to more popular tubes appeared in QST and
Communications Quarterly. Also, the 8875 tubes are in demand less and less
because, except for amateur use, there is little industrial/commercial 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 compact 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 dB, 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 commercial, industrial, and medical equipment. The
continuous and on-going use of these tubes will maintain the demand, resulting in a
reasonable supply and price stability. At today's prices, the 3CX400A7/8874 is
about $100 less than the 8875, and the 3CX800A7 is about $80 less. Therefore, to
re-tube the amplifier, at current prices, there is a net saving of $150 to $200. In the
future, as demand for the 8875 increases and availability decreases, the savings may
be more.
If you have recently purchased your MLA-2500 or MLA-2500B, you will want to check out the
power supply portion so that you know the starting point. Prior to turn-on, make a visual inspection
for dirt, loose wires, or damaged components. Ideally, you would have done this prior to purchase.
http://www.svetlana.com/docs/TechBulletins/technoteNo44.html
2004-01-05
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet 3CX800A7.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 3CX800A7 | 3CX800A7 | ETC |
| 3CX800A7 | 3CX400A7 / 3CX800A7 | ETC |
| 3CX800A7 | High Mu Power Triode |  Svetlana |
| 3CX800A7 | High Mu Power Triode |  PL |
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