New G1176 design ?
- Thread starter Gustav
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matthias
Well-known member
hi gustav,
the main improvements of the new board layout :
- no problems with hum anymore
- you can mount lundahl, or oep input and output transformers
- lundahl output transformer connection is "reversed"
to get enough gain out of the unit
- extra pad for stereo coupling
you can find all info here:
http://www.geocities.com/m_natsume/1176.html
I would be in for 4-10 pcs (I still have to ask some friends)
cheers,
matthias
the main improvements of the new board layout :
- no problems with hum anymore
- you can mount lundahl, or oep input and output transformers
- lundahl output transformer connection is "reversed"
to get enough gain out of the unit
- extra pad for stereo coupling
you can find all info here:
http://www.geocities.com/m_natsume/1176.html
I would be in for 4-10 pcs (I still have to ask some friends)
cheers,
matthias
matthias
Well-known member
gustav,
please ask "mnats" , he made the new 1176 layout,
I hope he can convert it to gerber format...
mat
please ask "mnats" , he made the new 1176 layout,
I hope he can convert it to gerber format...
mat
StrayCat
Well-known member
Matthias, that is a fine looking 1176 with a very nicely done DIY page. I didn't read the page word for word yet and there is a great deal of detail included. Nice work. Great photos. The door slam is to be listened to with caution volume wise. I couldn't slam a door any better than that myself. What revision board is this new 1176? Thanks for the post. Added the page to my favorites.
Zee1usa
Well-known member
Would the pcb be the same size or a bit bigger (LxW) ?
some of the components are a little tight on the first pcb. For example:
1) when my heatsink on the regulator the electrolytic cap needs to be
bent out of the way to fit which causes it to rub elbows with the 1K1...this may be the heatsink I am using?
2) The electrolytic caps next to the output Luhndal are just a bit of
tight fit as well.
No big deal at all I just thought if you were going to update the pcb
just a bit more space on a few tight components would be a small improvement, But compared to the other improvements mentioned
this is very minor.
:wink:
some of the components are a little tight on the first pcb. For example:
1) when my heatsink on the regulator the electrolytic cap needs to be
bent out of the way to fit which causes it to rub elbows with the 1K1...this may be the heatsink I am using?
2) The electrolytic caps next to the output Luhndal are just a bit of
tight fit as well.
No big deal at all I just thought if you were going to update the pcb
just a bit more space on a few tight components would be a small improvement, But compared to the other improvements mentioned
this is very minor.
:wink:
orson whitfield
Well-known member
Wow what a resource for this project. GREAT work putting that page together! I am definately interested in building some more of these.
matthias
Well-known member
@gustav: his username is "mnats"
orson whitfield
Well-known member
Any news on this NEW batch?
my 2 cents: hum is not only problem in Gyraf layout.
7824 is hot, and it is placed near gain reduction meter FET,
causing wrong meter reading after unit heats..
Also, this layout isn't best due to contami(ughthisenglish!)nation's
reasons-all hi-impedance pathes must be short and close to FET,
detector and att/rel.... or don't run some of 'em on PCB, using in very hi-z points wiring "in air" instead
(old Japan school learned from some cool Sur+ items
))
After building one 1176 from Gyraf layout, and freakin' with grounds
and other issues, I did mine layout and feel happy.
http://www.geocities.com/igor_jazz/1176pcb.html
Also, q bias and meter 0 moved to att/rel/ratio sw. board,
and added two relays for true bypass. Why 2?
You can use one relay and leave input trafo allways loading
output of your unit connected to '1176, but it is **ey style uggly trick ;-)))
(you know, one tub comp))
Power supply is external.
(btw, I asked people in TT times year ago if they checked wrong grounds in Gyraf Layout or it was only my bad work))
:grin:
Cheers,
Igor.
7824 is hot, and it is placed near gain reduction meter FET,
causing wrong meter reading after unit heats..
Also, this layout isn't best due to contami(ughthisenglish!)nation's
reasons-all hi-impedance pathes must be short and close to FET,
detector and att/rel.... or don't run some of 'em on PCB, using in very hi-z points wiring "in air" instead
(old Japan school learned from some cool Sur+ items
))After building one 1176 from Gyraf layout, and freakin' with grounds
and other issues, I did mine layout and feel happy.
http://www.geocities.com/igor_jazz/1176pcb.html
Also, q bias and meter 0 moved to att/rel/ratio sw. board,
and added two relays for true bypass. Why 2?
You can use one relay and leave input trafo allways loading
output of your unit connected to '1176, but it is **ey style uggly trick ;-)))
(you know, one tub comp
))Power supply is external.
(btw, I asked people in TT times year ago if they checked wrong grounds in Gyraf Layout or it was only my bad work
)):grin:
Cheers,
Igor.
gustev, if you do the new one Pcb I'm in for 4 :green:
nrgrecording
Well-known member
Igor!
Cool layout!
Good idea.. those relais switching.
If there is a chance to get the *.brd or jpeg file... send em to [email protected] :wink:
Cool layout!
Good idea.. those relais switching.
If there is a chance to get the *.brd or jpeg file... send em to [email protected] :wink:
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