Scope will help a lot, Before I bought a real one I used TrueRTA with my sound card. It was definitely useful.
I went through a similar troubleshooting experience back in 2005 with my amp (but was only one channel. Was tearing my hear out.
Scope will let you see if it is clipping too, and you can trace the signal through the amp and see if you can pinpoint where it is going haywire (if it is not clipping). Assuming the distortion will be obvious on a sine wave.
Tony.
I went through a similar troubleshooting experience back in 2005 with my amp (but was only one channel. Was tearing my hear out.
Scope will let you see if it is clipping too, and you can trace the signal through the amp and see if you can pinpoint where it is going haywire (if it is not clipping). Assuming the distortion will be obvious on a sine wave.
Tony.
You say the amp. is quite old.Electrolytics have a nasty habit of drying out and dropping dramatically in capacitance,not just those in the PSU.This could affect the circuit's performance.
Mira 2 is what, ~10 years old? Even typically hot running UK designs should still be fine at that age. Still, an early failure is not out of the question and heck, you should have fixed or at least simply added some parallel caps - any grade - to prove the point by now. You don't need instruments for that, at least.
Hi,
Did you check the speaker output relay contact? It is possible that they are dirty. If you have bad capacitors you should heard a hum in the speakers. If not the problem it is not bad capacitors. If you want to check if you have bad capacitors check the voltage with the meter in the AC. You should read almost zero voltages. That will tell if you have ripples in your power supply.
Did you check the speaker output relay contact? It is possible that they are dirty. If you have bad capacitors you should heard a hum in the speakers. If not the problem it is not bad capacitors. If you want to check if you have bad capacitors check the voltage with the meter in the AC. You should read almost zero voltages. That will tell if you have ripples in your power supply.
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