UA 1176LN re-issue bias update
« on: June 18, 2004, 03:33:21 PM »
gone...


Mark Burnley

UA 1176LN re-issue bias update
« Reply #1 on: June 18, 2004, 03:56:17 PM »
Whoaa!!

That's a bizarre fault- surely it would have been picked up at QC level?

Thanks for the heads up  :thumb:

Mark
O_O tape is life O_O

tommytones

UA 1176LN re-issue bias update
« Reply #2 on: June 18, 2004, 04:10:53 PM »
That's what happens when accountants run audio companies....  Astounding there are so many out there and no one has picked up on it.  Thanks for the heads up WO'B!
ToM

He who asks is a fool for five minutes, but he who does not ask remains a fool forever.
Chinese Proverb

UA 1176LN re-issue bias update
« Reply #3 on: June 18, 2004, 04:12:49 PM »
gone...

CJ

UA 1176LN re-issue bias update
« Reply #4 on: June 18, 2004, 06:00:55 PM »
Just ship it!
Don't make waves!
You get paid by the hour so whats the problem!!


you don't know how many times I use to hear that.
Thankfully, I work for a good company now.
 :guinness:
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

UA 1176LN re-issue bias update
« Reply #5 on: June 18, 2004, 06:43:30 PM »
gone...

soundguy

UA 1176LN re-issue bias update
« Reply #6 on: June 18, 2004, 06:56:51 PM »
W'ob, kicking out the jams!

dave

chips are good with dip...

matthias

UA 1176LN re-issue bias update
« Reply #7 on: June 19, 2004, 05:36:49 AM »
hi John...

thank you for your great info..


why is the reissue buildt with 5% resistors and no 1% metal resistors ??

just to save a few cents ??
to get more closer to the "original" ??
maybe better sound ??

cheers,
mat

UA 1176LN re-issue bias update
« Reply #8 on: June 19, 2004, 11:26:49 AM »
gone

Scenaria

UA 1176LN re-issue bias update
« Reply #9 on: June 19, 2004, 12:34:08 PM »
Both of my bloo 1176's use metal film throughout... with the exception of a few values..

Definately did not affect the sound of the box. compared to some UA re-issues...


Steve Jones

UA 1176LN re-issue bias update
« Reply #10 on: June 20, 2004, 02:46:34 AM »
I can see they're still using sockets for the FET's, I tried to find some in Australia but no-one carries them.
Synthesizer technician
Sydney Australia.

http://synthrepairs.com

bluebird

UA 1176LN re-issue bias update
« Reply #11 on: June 20, 2004, 03:14:26 AM »
Hey John maybe you can help sort this one out a bit:

way back in the day when I made my G1176 I was not getting enough gain out of it. some other people had this same problem. It turned out to be the way the o/p transformer was wired. leading up to this find, I was trying some other things to get the gain up. I stumbled across a different version of the line amp and used it. it seemed to add a little more gain. whats the deal with these two different line amps:

This one was the Gyraf version:




And this one was the one I ended up using:




I think the biasing of Q5 is different.

whacha think?

UA 1176LN re-issue bias update
« Reply #12 on: June 20, 2004, 12:30:54 PM »
gone

flyingfader

UA 1176LN re-issue bias update
« Reply #13 on: June 20, 2004, 01:41:39 PM »
>>... don't recoginize the version that Jakob is using...<<

Hey John,
It seems to be the "K" version if I refer to this documents,

http://site.voila.fr/flyingfader/audio/1176LN/1176_Rev_A_K.pdf

Credit to the original poster...BTW don't remember his name, sorry.

Fly
"Any instrument when dropped will roll into the least accessible corner."

matthias

UA 1176LN re-issue bias update
« Reply #14 on: June 20, 2004, 02:22:26 PM »
@ bluebird:  
do you have enough gain now  with the Q5 biasing of rev. f ??

mat

bluebird

UA 1176LN re-issue bias update
« Reply #15 on: June 21, 2004, 03:14:17 PM »
Yea I got a little more gain, 6db sounds right like john said. it still wasn't enough untill I wired the OP transformer differently.

matthias

UA 1176LN re-issue bias update
« Reply #16 on: June 22, 2004, 03:41:39 AM »
as far as I know, jakob designed the G1176  as the 1176 rev. F

does anybody know what's the technically difference between the biasing of q5 at the rev. f and rev. k output stages... ???

jakob ??

tamtamstudio

UA 1176LN re-issue bias update
« Reply #17 on: June 22, 2004, 07:12:59 AM »
I've just ended a couple of 1176, but seems it loose 3-4 dB of gain in bypass and more than 6 dB if it's on.
it seem always a little bit distorted (like overcompressed).
They loose 6 dB circa..
How can i modified It?
Is it a trafo wiring problem?
Please explain me better.. i've got an headache..


 

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