Studer 169/269

[Mc Cat]

Thanks to all for the help on this project.

The mixer is dead quiet now after replacing the caps on the rails located on the chassis (it's a big .1 uf and some .022uf).
After replacing those the hum disappeared.

As other suggested, I do have a ground loop in the patchbay too, which I haven't find a solution yet. I've read a few post and articles about the subject. It seems that there is no one solution fits all answers. If anybody has any tip / good practice...

while continuing the restoration of the Studer, I get a pop every time I put a channel in solo or in mute. I know there is a circuit in charge of that and the fault is probably around there, any specific clue on where to look? (like I said before, the console is all recapped on electro and tantalum).

 

[Mc Cat]

Hello, I can't find Mr. Nhaudio online. I have a picture of the master line here. I wonder where he replaced the two capacitors? Can anyone with experience help me? Thank you very much.

 

[Mc Cat]

Hi sir, i bought this 269 and saw the same problem in the speaker as you above. I also replaced many capacitors of the line master, still having the same problem, but I see that the fader of the linemaster has been replaced. Another German company, I hope the seniors will only dare to let it operate smoothly again, thank you.

Thanks to all for the help on this project.

The mixer is dead quiet now after replacing the caps on the rails located on the chassis (it's a big .1 uf and some .022uf).
After replacing those the hum disappeared.

As other suggested, I do have a ground loop in the patchbay too, which I haven't find a solution yet. I've read a few post and articles about the subject. It seems that there is no one solution fits all answers. If anybody has any tip / good practice...

while continuing the restoration of the Studer, I get a pop every time I put a channel in solo or in mute. I know there is a circuit in charge of that and the fault is probably around there, any specific clue on where to look? (like I said before, the console is all recapped on electro and tantalum).

Thanks to all for the help on this project.

The mixer is dead quiet now after replacing the caps on the rails located on the chassis (it's a big .1 uf and some .022uf).
After replacing those the hum disappeared.

As other suggested, I do have a ground loop in the patchbay too, which I haven't find a solution yet. I've read a few post and articles about the subject. It seems that there is no one solution fits all answers. If anybody has any tip / good practice...

while continuing the restoration of the Studer, I get a pop every time I put a channel in solo or in mute. I know there is a circuit in charge of that and the fault is probably around there, any specific clue on where to look? (like I said before, the console is all recapped on electro and tantalum).

 

[Mc Cat]

Hello sir,long time no see NH Audio online. I want to ask which 2 capacitors you replaced in the line master picture I attached, is there anyone with good experience who can show me? Thank you very much

 

[zamproject]

I want to ask which 2 capacitors you replaced in the line master picture I

I suspect the talk is about capacitor on the bus board, in the background of the frame, not on modules.

the caps on the rails located on the chassis (it's a big .1 uf and some .022uf).

IIRC you won't see them on top where connector sit on the bus pcb, but the other side. You'll need to remove back panel or bus bar pcb (after all modules)

 

[radeng]

As they were selling these to the BBC and many other broadcasters, the noise specs were state of the art at the time. Should not have a noticeable noise floor in the monitors unless the mic pres are boosted to the max. My 961 has almost no noise on the line inputs, even when cranked. Sounds like you found the bad caps, good job.

Curious why you need an external monitor box. Studer consoles have very comprehensive monitoring sections (more broadcast heritage), unless you are feeding multiple monitor systems in which case you could just add a switch as someone else noted above.