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Old 20th February 2013, 03:41 AM   #11
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If you drive a strong signal into the amp (preferably a 50-100Hz sine wave) and vary the volume from 0 to near the maximum from the signal source, you should be able to see an AC voltage there that varies with the volume of the signal source.
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Old 20th February 2013, 03:42 AM   #12
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Will ground to the negative terminal block be acceptable?
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Old 20th February 2013, 03:45 AM   #13
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If you're referring to the placement of the black meter probe, it should be OK. The negative speaker terminal may be a better choice.
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Old 20th February 2013, 03:51 AM   #14
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I see 8V on one side and 15.36 on the other AC volts... Used a 50 hz tone... Gave a nice steady reading. Got worried when it started going crazy, but it turns out the sine was over and a song was next. Lol.
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Old 20th February 2013, 03:59 AM   #15
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Does your 12v DC power supply have an amp meter on it?
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Old 20th February 2013, 04:02 AM   #16
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No.. I use a small 7Ahr 12V battery from an emergency light; With the head light to limit current.
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Old 20th February 2013, 04:05 AM   #17
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If you adjust the bias pot in the amp, does the headlight get dimmer/brighter?

Do this with the transistors clamped or watch their temperature VERY closely to make sure that they don't overheat.
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Old 20th February 2013, 04:15 AM   #18
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The brightness did not change. I marked the position with a pencil and tried turning both directions.
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Old 20th February 2013, 04:18 AM   #19
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Just found a resistor at R166 that is fairly dark, but tests ok at 100 ohm.
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Old 20th February 2013, 04:35 AM   #20
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You stated that you had 25v on the output transistors. When you drive a strong signal into the amp, does that voltage become greater for either set of outputs?
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