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jimbartlett

Trace Elliot GP12 SMX

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My P Bass with Antiquity pickups has the gain on 10 (no red peak, just yellow OK). The J Bass with standard pickups has the gain on 8/9.

I must say, it did feel like I was doing something wrong when I first used the amp but soon came to realise exactly the statement above about getting the correct amount of gain into the amp to allow it to sing.

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13 hours ago, jimbartlett said:

My P Bass with Antiquity pickups has the gain on 10 (no red peak, just yellow OK). The J Bass with standard pickups has the gain on 8/9.

I must say, it did feel like I was doing something wrong when I first used the amp but soon came to realise exactly the statement above about getting the correct amount of gain into the amp to allow it to sing.

same for me, I use a P bass and just whack the gain up to 10, the warning light doesn't come on, whenever someone borrows my amp they always turn it down, and the one at the rehearsal studio is never on 10 when I get there, they're obviously not using their ears or the warning lights

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I think the secret is that this gain control circuit doe not have a liner frequency response. As VR1 is increased the amount of negative feedback, reducing gain. C1 means that the treble will drop off faster than the bass with the effect that the sound will be less 'lively' at lower gains. No component values and I'm not familiar with the details but that's what I think is going down! I would be interested what someone with more knowledge of audio amp design has to say:

image.png

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