Hello all!
I posted this on the all 1176LN thread but, nobody answered, so I'm posting here to be more visible, I think this is a known problem...
Well, I build some 1176LN Rev D, Rev A, Rev F and Rev J and all of them has the same minor problem: The VU's needle never stays quiet in GR mode with no signal, it always slightly swing around the "0" VU... Rev A is better than the others in this case... I experienced one original 1176LN black faces (REV D) and the needle is solid as rock pointing to the "0". even when I switch between +4 and GR the needle goes back to the "0" quick and firm...
I read, read, read here in the forum, and some people say that the original do the same thing, others are talking about a eventual dirt around the FETs... well, I clean the FETs, saw the original by myself and stand the opinion that, somehow, it must have any other reason to this happens!! circuit? VU? component's placement?
I tried with Hairballs big and small VUs, tried with SIFAMs AL29WF and AL19WF... all the comps act the same!
I have the FETs perfectly matched, Q12 and Q13 matched.... used 2N5088 with HFEs between 500 to 600 (greater that the 250 asked), all done, and regulated as it should! the comps sounds and acts perfectly, but that issue annoys me a lot...
any help or ideas???
Cheers,
Eddie.
I posted this on the all 1176LN thread but, nobody answered, so I'm posting here to be more visible, I think this is a known problem...
Well, I build some 1176LN Rev D, Rev A, Rev F and Rev J and all of them has the same minor problem: The VU's needle never stays quiet in GR mode with no signal, it always slightly swing around the "0" VU... Rev A is better than the others in this case... I experienced one original 1176LN black faces (REV D) and the needle is solid as rock pointing to the "0". even when I switch between +4 and GR the needle goes back to the "0" quick and firm...
I read, read, read here in the forum, and some people say that the original do the same thing, others are talking about a eventual dirt around the FETs... well, I clean the FETs, saw the original by myself and stand the opinion that, somehow, it must have any other reason to this happens!! circuit? VU? component's placement?
I tried with Hairballs big and small VUs, tried with SIFAMs AL29WF and AL19WF... all the comps act the same!
I have the FETs perfectly matched, Q12 and Q13 matched.... used 2N5088 with HFEs between 500 to 600 (greater that the 250 asked), all done, and regulated as it should! the comps sounds and acts perfectly, but that issue annoys me a lot...
any help or ideas???
Cheers,
Eddie.