Holger

S-AOC Modular Optical Tube Compressor
« on: March 26, 2019, 04:13:59 PM »
More modular madness: after building my modular tube pre amp I've finished an optical tube compressor. Essentially it's the famous AnalagOpticalCompressor published here ten years ago. I've built a couple of them in 19“ format and still find think that it is a wonderful unobtrusive compressor.
Unfortunately the Vactrols are not available anymore; I've hoarded a couple over the years. All Kubi mods are incorporated. The main difference to the original AOC is the 12.6V heaters. I'm using SMPS for heaters; 12.6V is easier to build since 6V SMPS are quite rare.
I/O TX are Sowters. The module is 10HP so I can put 8 channels in a standard Euro Rack.
The meter light goes off when in bypass. Front panel is printed (www.frontpanels.de).





Re: S-AOC Modular Optical Tube Compressor
« Reply #1 on: March 26, 2019, 04:46:54 PM »
Very nice, as always.

weiss

Re: S-AOC Modular Optical Tube Compressor
« Reply #2 on: March 26, 2019, 07:07:14 PM »
Wow  :o

I'm always surprised how people manage to squeeze pieces of 19" rack gear into this little format. Amazing

Sorr

Re: S-AOC Modular Optical Tube Compressor
« Reply #3 on: April 03, 2019, 07:08:39 PM »
Which Sowter output transformer are you using?


ruffrecords

Re: S-AOC Modular Optical Tube Compressor
« Reply #5 on: April 05, 2019, 04:54:57 PM »
Superb quality build as always Holger.

I notice you have a cut out in the PCB where the tubes stand. What is the reason for this?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Holger

Re: S-AOC Modular Optical Tube Compressor
« Reply #6 on: April 06, 2019, 02:02:53 AM »
I hope for a better heat/air flow here. I've taped a sensor on top of the solen and measured 39°C after a couple of hours (at 22°C room temperature) which is absolutely fine for a tube module.

ruffrecords

Re: S-AOC Modular Optical Tube Compressor
« Reply #7 on: April 06, 2019, 02:37:21 AM »
I hope for a better heat/air flow here. I've taped a sensor on top of the solen and measured 39°C after a couple of hours (at 22°C room temperature) which is absolutely fine for a tube module.

Yes, anything less than 40 degrees is good.

I assume you are still using Fischer die cast modules? Do they have pierced vents top and bottom in the 10HP size?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Holger


ruffrecords

Re: S-AOC Modular Optical Tube Compressor
« Reply #9 on: April 06, 2019, 01:25:59 PM »
Yes, I'm using Fischer F-modules (IIRC)

OK. They are quite neat as long as you can put up with the 14.2mm space between the front panel left hand edge and the top surface of the PCB (which you probably can in a 2 inch wide module). In my home brew 1.4 inch modules my PCB top surface is just under 4mm from the left edge of the front panel giving me an extra 10mm height for components and the same additional front panel space.

One last question. 8 x 10HP = 80HP but a sub-rack is 84HP wide. How do you fill the gap?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


Holger

Re: S-AOC Modular Optical Tube Compressor
« Reply #10 on: April 08, 2019, 02:44:56 PM »
OK. They are quite neat as long as you can put up with the 14.2mm space between the front panel left hand edge and the top surface of the PCB (which you probably can in a 2 inch wide module). In my home brew 1.4 inch modules my PCB top surface is just under 4mm from the left edge of the front panel giving me an extra 10mm height for components and the same additional front panel space.

One last question. 8 x 10HP = 80HP but a sub-rack is 84HP wide. How do you fill the gap?

Cheers

Ian
Once I'll have 8 modules I'll use a 4 HP blank panel.


 

Related Topics

  Subject / Started by Replies Last post
40 Replies
21382 Views
Last post May 02, 2005, 02:52:11 AM
by gyraf
18 Replies
5839 Views
Last post February 03, 2012, 08:27:42 PM
by electrochronic
18 Replies
12977 Views
Last post May 01, 2013, 06:28:11 PM
by alexc
5 Replies
1226 Views
Last post June 13, 2019, 12:48:09 PM
by weiss