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Forte Model 1 and Forte Model 3 Adjust Bias
Forte Model 1 and Forte Model 3 Adjust Bias
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Old 30th May 2020, 09:18 PM   #1
EddieRock is offline EddieRock  United States
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Join Date: Feb 2020
Location: Minneapolis, MN
Forte Model 1 and Forte Model 3 Adjust Bias
Default Forte Model 1 and Forte Model 3 Adjust Bias

I've read a few posts here about adjusting the Bias and I'm a bit confused on which resistors are the emitter resistors. I've attached a pic of the board. Can someone point out which is the emitter resistors and which posts I should get the meter readings from when adjusting?

See attached image. Ultimately, an arrow to the component would be helpful

Also, there is talk about replacing the pot for a 20 turn and this board has one I believe. Can someone send me a link to the correct POT to purchase? I've got a Forte Model 3 and a Forte Model 1 that I'm getting up and running.

thanks for all you do!
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File Type: png forte3board.png (579.2 KB, 47 views)
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Old 30th May 2020, 09:44 PM   #2
llwhtt is offline llwhtt  United States
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The right leg of the big transistors are the emitters and connected to each emitter is a big gray resistor, that's the emitter resistor. Put one DMM lead on one end and the other lead on the other end. Use mini-grabbers or clips if you have them. The left leg is the base and the middle leg is the collector.

Craig
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Old 31st May 2020, 05:30 PM   #3
EddieRock is offline EddieRock  United States
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Join Date: Feb 2020
Location: Minneapolis, MN
Forte Model 1 and Forte Model 3 Adjust Bias
So, what your's saying is measure where the two arrows point in the pic below?

Also, do I have to measure the reading on all or is just one good enough?

Thanks!
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File Type: png forte3board_with_arrows.png (580.0 KB, 21 views)
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Old 31st May 2020, 06:37 PM   #4
Chamberman is offline Chamberman  United States
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Location: USA, Dallas/Ft Worth, Tx
Yes measure where the two arrows are pointing.

Just measure across the one resistor. The other resistors are assumed to be the same.
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