bonedog569
1043 posts
Jul 22, 2016
5:17 PM
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So I'm still loving my little GA5 vintage Les Pal Jr. amp, but wiring in a line out hasn't worked out as well as I'd hoped. It works but I get a bit of nasty distortion added to the sweet breakup you hear from the speaker. Looking at the waveforms of the signal recorded with a mic, and the signal straight from the line out to my DAW, the bottom half of the line-out wave looks clipped, the mic recorded wave looks normal. I had the same issue from the line out on the Lone Wolf se 6l6 amp I built.
I used the design on this link line out guide Kalamazoo amp field guide
Thoughts anyone?
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Bone's music videos
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Greg Heumann
3259 posts
Jul 22, 2016
10:00 PM
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How does the signal wave form compare to what the speaker is seeing? If there's clipping, it is the amp's design. The line out circuit is nothing more than a 10:1 voltage divider. It shouldn't have an effect on wave form.
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/Greg
BlowsMeAway Productions
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bonedog569
1044 posts
Jul 23, 2016
11:23 AM
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Greg- I just emailed you with pic.s of waveforms and recordings of the output. Easier than doing that here on mbh. I can post follow up here if I get anywhere. Thanks
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Bone's music videos
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jpmcbride
118 posts
Jul 23, 2016
8:13 PM
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Greg is right, two resistors should have no effect on the waveform.
People use all kinds of values for the resistors - I generally start with 10K and 1K.
Sometimes the sound from the line out is too harsh. I find that a capacitor across the bottom resistors helps. All your doing is making a low-pass filer - rolling off the highs. You have to just play with values to find what sounds right for your amp and your ears, but .1uf is where I remember starting.
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Jim McBride
www.bottleoblues.com
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