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3CX400A7 の電気的特性と機能

3CX400A7のメーカーはETCです、この部品の機能は「3CX400A7 / 3CX800A7」です。


製品の詳細 ( Datasheet PDF )

部品番号 3CX400A7
部品説明 3CX400A7 / 3CX800A7
メーカ ETC
ロゴ ETC ロゴ 




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3CX400A7 Datasheet, 3CX400A7 PDF,ピン配置, 機能
Easy DENTRON MLA–2500 Conversion using SVETLANA
3CX400A7
3CX800A7
www.DataSheet4U.com
Complement to Svetlana technote #44
Provided by sm2yer

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3CX400A7 pdf, ピン配列
www.DataSheet4U.com
Photo A.
Complement to Svetlana technote #44
Photo B.
Provided by sm2yer


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3CX400A7 電子部品, 半導体
Technical Bulletin 44
Sida 2 av 6
Since many of these amplifiers will be available without tubes or with weak or bad tubes, some
additional precautions should be taken. Remove the top and remove any existing tubes. Make certain
the plate connections are not near or touching anything. The initial turn-on should be at less than
full-line voltage. I prefer to use a variac or a 150-watt lightbulb in series with the primary power line.
Half-voltage may easily be achieved by strapping the PA primary power for 220 VAC operation and
using 110 VAC primary power. A low voltage/soft start is a good idea in case the MLA-2500 has not
been operated for some time. This will allow the electrolytic capacitors to "form" and not destroy
themselves. Depress the Plate Voltage Meter switch and depress the Tune/Operate switch to Tune
position.
EXTREME CAUTION must now be observed, as there is access to LETHAL
VOLTAGES. With the amplifier connected to a primary power source, turn
the power switch to "on"; nothing should happen. With one hand behind your
www.DataSheebt4aUc.cko,mand using only one finger of the other hand, momentarily close the
micro switch (interlock) at the top right rear of the PA and observe the plate
voltage meter. It should rise to 1000-1500 volts if there are no problems. The
fan will also operate. If there is no arcing or other problems, again close the
micro switch and hold it in place for a minute or so to assure operation
After the above-described initial turn-on, the amplifier should be operated at full voltage for a longer
period of time in order to verify power supply performance. The micro switch should be temporarily
closed. I used a plastic bag tie wrap. Carefully make needed measurements now to verify that all the
appropriate voltages are available.
If you desire to try operation with tubes received with your amplifier, this is the time to do so.
THE 3CX400A7 CONVERSION
The 3CX400A7/8874 is electrically identical to the 8875. There are two mechanical differences.
First, and of most importance to us, the 3CX400A7 cooling air must be applied axially through the
radial anode cooling fins, like the famous 4CX250 series. The 8875 cooling air is applied in a
transverse manner across horizontal fins. Second, the plate power dissipation of the 3CX400A7 is
400 watts, while the 8875's is 300 watts. The additional 100 watts per tube provides additional
margin for cooling. It does not provide additional RF power output.
We need to construct a plenum or other device to change the direction of the air flow from parallel to
the chassis to a vertical direction, and through the cooling fins of the 3CX400A7/8874 anode. A
similar change in direction of the air flow was necessary to use the 4CX400A conversion . That
solution also involved making a plenum.
The holes in the bottom of the chassis must be sealed. I used duct tape, as was used for the 4CX400A
conversion. It should be possible to use a very thin fiberglass material; however, I found the duct
tape to be satisfactory.
Next, the side panels of the plenum must be fabricated. G-10 is an ideal material, although I used a
good grade of Masonite for the 4CX400A conversion, and it has now been operational for two years.
Figure 1 shows the approximate dimensions of the side panels. When cutting the two pieces for the
side panels, leave an extra 1/8 inch in each dimension, in order to file them to fit. Two "L" brackets
were fabricated from soft aluminum strips about _ inch wide. Install these brackets to hold the side
panels and to assure that there will be metal to drill holes for mounting to the bottom of the MLA-
2500 chassis. By moving the thermostatic switch to approximately the center of the long panel, it
will respond equally to both tubes. The hole vacated by the stud holding the switch now provides a
convenient mounting hole for one of the "L" brackets to hold the long panel in place. A second long
panel "L" bracket and the new horizontal mounting position of the thermostatic switch may be
http://www.svetlana.com/docs/TechBulletins/technoteNo44.html
2004-01-05

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部品番号部品説明メーカ
3CX400A7

3CX400A7 / 3CX800A7

ETC
ETC


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