Thanks for making that really simple for me to understand. appreciate it
@johnny7254
2 жыл бұрын
And the hits just keep on comin' -- another brilliant video wherein you discuss important fundamental concepts. Thanks Ray.
@magentaline
6 ай бұрын
Ray, this is great information! I just setup a Sherwood receiver by using this tutorial, it came out great. Thanks again!
@raygianelli3612
6 ай бұрын
Very cool! Thanks for posting.
@James_Bowie
10 ай бұрын
Would have been interesting to see what the THD was when you set the bias current to 30mA.
@raygianelli3612
10 ай бұрын
Damn good thought. It would be interesting to see it in a real time spectrum too.
@brianohara8554
2 жыл бұрын
Just last week I was just trying to figure out how to bias an amp with no service notes. I feel like I can tackle that amp now. Thank you!
@raygianelli3612
2 жыл бұрын
Glad to hear it, Brian!
@roelandriemens
2 жыл бұрын
Nice video again. 🙂 Does temperature of the amplifier influence bias current much?
@raygianelli3612
2 жыл бұрын
Thanks Roeland! Yes it does. That's why audio amplifiers have some manner of thermal tracking, either a thermistor or transistor tied into the bias circuitry.
@Bluelagoonstudios
2 жыл бұрын
Learned a lot, unfortunately, I don't have all the equipment yet, to analyze for one, scope is ok, lab supply is also ok, variac is also here, a safety transformer is also here, from 6 Amps, 230-230VAC, only one old multimeter. But still a good one. A glow lamp in series with the load is also here. The only thing I need is a signal generator, and an analyzer. But I get there. Thanks
@mumbles552
2 жыл бұрын
Thanks for posting this and I really enjoy the way you explain things, straight from the hip! Subbed.
@salvadorrodenas3071
2 жыл бұрын
Very enlightening video of a good point of controversy in power amplifiers.
@Foozlebop
2 жыл бұрын
Another excellent video
@jjcalvillo
2 жыл бұрын
Ray, when you zoomed the sine wave on the scope and adjusted the meter read 13 mV. After you showed the math, the meter was reading 6.9mV. What happened?
@raygianelli3612
2 жыл бұрын
As I mentioned (but failed to make clear) is that the DMM won't give an accurate reading of bias when signal is running into the amp. That's why service manuals state setting bias under no signal conditions.
@texdentist
2 жыл бұрын
Great video. I always learn something from them. I happen to be repairing a Marantz 2245 that came with a blown amp. I found the bad components and got it sounding good, but while in there, I changed the early model cylindrical bias transistor to the a newer TO-220 type. First try at setting bias, it won't go above 3.9 mV. I need to check the trimmer, but when I get back into it, I'm going to look at a low level 20kHz signal and see what is happening with the crossover distortion. Maybe I'll learn a little more. 😊
@raygianelli3612
2 жыл бұрын
Thanks Steven, but right back atcha... I always read your posts on AK for the same reason, to learn something I didn't know.
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