Originally Posted by jvgillow
Cool stuff Chuck. That is quite a nice looking test rig.
Thanks, Jeremy! Bring an amp by next you're down this way.
Originally Posted by price3
How did you come up with this resistance load device? What do engineering firms use to do this? You are the coolest guy I "know" Chuck. If not for the hurrricanes I'd have to move down there to watch all the smoke and sawdust that pours out of your shop. Also, how long are you holding these amps at each level to perform your measurements?
I got the idea from some links thylantr sent me to for some pro audio guys. Actually back in the old days you would use Dale RH250 non-inductive wirewound resistors. A 250 watt, 8 ohm resistor would cost about $100.00 each. Buy 4 of them and you could easily test 4, 8, aand 16 ohm capabilities. But remember the biggest amp back then was a Phase Linear 700. I will have to say I saw a 10,000 watt, sea water cooled load bank at the Crown factory when I went there for training. It had a room all by itself!
How long am I holding these amps at power? Well, these amps won't take steady state sine wave testing at their published limits very long. At the higher wattages and lower impedances, maybe 30 seconds. At high power and 8 ohms, they will run almost all day at full power into a load at any frequency.
I will have some more amps tested this weekend if Yuri comes by, otherwise I will sneak into ssabripo's house and steal his amp to try out!