muovimies
Super Member
What could cause a low reading like this?
The amplifier working exactly as it should?
What could cause a low reading like this?
Any cause for concern for voice coil damage? Will definitely not be using it until its fixed, but with measurements of .5mv in one channel and 10mv in the other, i would i think it at least wasn't a danger at the time of using it.Oops...sry.
The 555ii has a servo control for DC offset, and should measure about 1mV or less on both channels. Might take a minute or two to get there, but unless both channels ultimately drop to a very low reading, there's an issue.
Heatsinks getting hot is a bias issue.
Thank you for clarifying!The polarity of the measurement is not important as the offset pair can drift in either direction + or -. Your offset readings are just fine.
Can you fill me in on that switch on the back? One position is direct coupled and the other is cap coupled. Does it matter which position the switch is in when testing the offset? What is the benefit to each position in regular usage?517 has offset adjust.
http://www.audiokarma.org/forums/index.php?threads/au-717-with-remote-control.74391/#post-734059Can you fill me in on that switch on the back? One position is direct coupled and the other is cap coupled. Does it matter which position the switch is in when testing the offset? What is the benefit to each position in regular usage?
I ordered a set of TV adjustment screwdrivers off eBay today. I figure I'm better off poking around in there with a non-conductive stick. I'll let you know how it goes. Thanks for all the help.517 has offset adjust.
Does anyone have any insight on this? I'm not sure how (if any) SS home stereo amps and instruments amps relate as far as this test goes....talking about guitar instrument amplifiers (and bass guitar), but do the same rules apply? As for the ones that test around 100mV; do they basically have bad transistors/drivers/capacitors/other failure?
Also, are these safe DC voltages to run a speaker on?Carvin B3000 (250W solid state bass amp) #1
130mV
Carvin B3000 #2
105-110mV
Yamaha B100 (100W solid state bass amp)
100mV