[xcalibur]

hi...i've been trying to build my first meta42 and before i biased my amp into class A everything was working fine...all i have to do to bias to class A is to add the 5484 and 5486s and R10 right?

Anybody knows if the echoing could be caused by something else?

 

[xtreme4099]

which op amps do you have...

 

[xcalibur]

using 8620...but it was working fine before i biased it into class A..

 

[Excalibur]

Go here and check to see if you did the biasing correctly.

http://tangentsoft.net/audio/opamp-bias.html

 

[xcalibur]

Quote:

Go here and check to see if you did the biasing correctly.

Hey excalibur! yeah...i've already look through that more than a few times....

 

[tangent]

Echoing....perhaps you are hearing the ambient background, such as reverbs of the instruments in the recording space? If so, what you're hearing is that the common parts (i.e. what you hear in both channels) are cancelling out and you're left with just the unique bits in each channel. In other words, somehow you're getting massive crosstalk of some sort. Check for shorts.

 

[ppl]

as tangent sed and also check for High resistence or an open circuit on Input or headpnone ground. a lost com. ground from either Headphones or Input causes a mono out of phase signal on the outputs of both channels.

 

[xcalibur]

hi..thanks for the advice:

tangent...i've checked for shorts and don't see any

ppl...i've checked the connection on inputs and outputs..all are fine..however...i do think something is wrong because when i unplug the right channel the sound becomes mono...is this normal? it should just be coming from the left right?

 

[dd3mon]

Quote:

Originally posted by xcalibur hi..thanks for the advice: tangent...i've checked for shorts and don't see any ppl...i've checked the connection on inputs and outputs..all are fine..however...i do think something is wrong because when i unplug the right channel the sound becomes mono...is this normal? it should just be coming from the left right?

That means your right and left channels are shorted somewhere. Look harder

-dd3mon

 

[ppl]

since the last thing you did was put in the Current source fet for the op amps I would look close around that area for a short or solder bridge.

 

[xtreme4099]

just go over your soldering like ppl said ... try different phones ... make sure your 1/4 jack connector aint the issue (inside joke)...

 

[OriginalReaper]

i'm bound to sound like an idiot, but i guess i'm just gonna have to get used to it...



maybe the amp is revealing sounds previously hidden. try changing to another track (maybe even another album).