Re: 6101 Def Board Prob

The monitor that will burn if the output transistors are missing is the
Cinematronics/Vectorbeem monitor. I don't believe it's a problem with any others.

Tek wrote:

> Okay guys..
>
> I've just made a small test to see what happens. Crazy I am.
>
> Nothing happened, when I took out the power transistors notihing started to
> smoke. Then I probed around with my finger to see if any of the pre-amp
> transistors or resistors turned hotter than normal. Zilch (this with the AVG
> still driving the amplifiers).
>
> As far as I can see the amplifier is a very classic one. The only fundamental
> difference of your ordinairy everyday audio amp seems to be the feedback - It is
> taken from a sensing resistor (in series wiuth the yoke) through which all the
> Yoke current runs as well. This way the Yoke current determines the feedback
> signal, and not the voltage at the output (ofcourse they're still related). See
> it this way, being the Yoke and the 10W sensing resistor a voltage devider, the
> current through the Yoke and resistor varies the voltage over the sensing
> resistor in a linear way. Therefore feedback is now related to the magnetic
> 'strength' of the yoke, since this is linear with the Yoke current. This gives
> you nice linear defection, regardless of the impedance behaviour of the Yoke.
>
> Comments are very welcome, as always!
>
> Cya !
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Received on Thu Sep 21 05:47:03 2000