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John A. Weeks III
 
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Default Testing Output Transistors

In article 41177a30$0$3099$afc38c87@, solex wrote:

Do you think that it would be possible to switch the output drivers
(LM391-100, from one board to the other) without causing any harm to the
system or the "good" output driver? My concern is that the components on
each of the boards are some how configured "balanced" for each output driver
and their respective components, and switching then would result in damage
to the ouput driver.


In many transistor designs, pairs of outputs need to be matched
for gain. That is the HFE value for each transistor, and it
actually needs to be measured, not read off of a data sheet.
You can swap entire groups of outputs right for left, but don't
move them to other positions, or get them mixed up. Many amps
have adjustments that need to be made after a change like this,
such as the DC Offset and gain controls.

-john-

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John A. Weeks III 952-432-2708
Newave Communications
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