Managed to fix it. Turns out it was the grounding/power supply arrangement, as you probably guessed.
It seemed very sensitive as to where the power was coming from, to the preamp or the power amp first.
So to make it more stable I put a 7ohm resistor on to the positive supply of the preamp.
Works beautifully now.
I have read those books that tell you about star grounding/power supply stuff but I guess I just didnt understand what they meant!
It seemed very sensitive as to where the power was coming from, to the preamp or the power amp first.
So to make it more stable I put a 7ohm resistor on to the positive supply of the preamp.
Works beautifully now.
I have read those books that tell you about star grounding/power supply stuff but I guess I just didnt understand what they meant!
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