Am I gong crazy, or tie straps = lean?

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mattjk

Member
Joined 2004
I finished my wiring, and I used about 20 tie straps to clean up the wiring. after wards, I fired the amp back up and it became thin and bright sounding. Am I imagining things???

a before picture:

original.jpg
 
A

AndrewT

R.I.P.
Joined 2004
close coupling the wiring may have changed the HF impedance loading on the output leading to reduced phase margin.
Or it may be feeding back some signal to the input, again decreasing the phase margin.

If you decrease the phase margin you bring the amp closer to instability but you also increase the peaking on the faster signals giving this shrillness.

This is a similar problem to a badly laid out PCB.

Well spaced wiring is better than close. Wires crossing at right angles is better than running parallel.
 
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