[Trench Recordings]

Holger/Ian kits avaliable soon  

[Spiritworks]

I would like to know if this is a one-off or a prototype ?

[Holger]

Never say never, but I think that this will be an one-off for now.

[EmRR]

Amazing work there. 

[Holger]

Gents, thanks for liking.
I've recently got a review in German "Studio Magazin", they like my mixer.

Here are detailled pics of the back modules.

I/O



Insert (tube buffered)




L/R Mix, inserts, external meter, 2 TR in



Monitor Out, Aux Send



Auxiliary line input. This sends a stereo signal directly to the master fader (L/R bus). The level can be adjusted with the potentiometer.



The little "helper" modules:

Bo Hansén DI Box



Lundahl 1581XL signal splitter



8 channel passive summer, I/P 1+2 are mono



And finally the channel signal flow

[EEMO1]

 you got to be f**king kidding me! awesome work!

[thomasdf]

holy molly...
mind = f'in BLOWN.

That build is probably the most impressive DIY build I've seen yet...
WOW.

Interesting in more pictures in the studio, feedback about its sound etc...

[leitmo]

DIY of the decade!

[braeden]

Congratulations to both Holger & Ian for such an amazing project with (obviously) endless capabilities!

[[silent:arts]]

http://www.kraessemaschine.de/

[Holger]

Thanks Volker.

We have an English version now, maybe there are some typos and grammatical issues.

http://www.kraessemaschine.de/cms_en/

[duantro]

This is beautiful! nice work Holger!

[Whoops]

Congratulations Holger,
Thats one of the most amazing projects I've seen!

It probably sounds as Good as it Looks!

[dandeurloo]

Very cool.  Thanks for posting and sharing. 

[saint gillis]

  We want to listen to some stuff recorded throught it !

[FunkySlap]

Where are the gooseneck lamps and leather armrest? 
.. It looks very neat and warm, but soundclips.. anybody can combine modules and wood and make it look like a mixer....   

No, really nice looking console.. I am impressed by the diy community ... and the amount of hours some people put into projects.. 

[vitopower]

I don’t know how I missed this.  When the page loaded the first pic… “Oh, F#@K”. jaw drop.
Outstanding!

[cyrano]

Magnificent!

[Tubetec]

Hi Holger ,
She's a beauty for sure , but just wondering about heat and ventilation , might be a plan to create vents/grills allowing cold air in from below and warm air to escape from the top , it must start to run hot after a few hours use.
Ill keep an eye out for when you post some samples of music from the beast.

[ruffrecords]

Hi Holger ,
She's a beauty for sure , but just wondering about heat and ventilation , might be a plan to create vents/grills allowing cold air in from below and warm air to escape from the top , it must start to run hot after a few hours use.
Ill keep an eye out for when you post some samples of music from the beast.

Holger (and I) use modules made from 'cassettes' made by Fischer Elektronik. Most consist of a couple of left and right aluminium extrusions with a front panel and a back connector plate. One type of cassette has built in perforated panels at the top and bottom so convection draws cool air in at the bottom and warm air drifts out the top.

In my view, tubes get a bad pres about heat. This probably stems from power amps where large quantities of heat are produced. But in a mixer, all the tubes are low power. A typical 6.3V at 0.3A heater consumes under 2 watts. Holgers monster has 63 tubes if I remember correctly so that is less than 130W of heat - my bathroom heated towel rail consumes more than that. The HT is no worse. Each tube consumes 5mA at 300V on average which is 1.5W so 63 tubes consume less than 100W. In total the whole thing consumes less than 230 watts.

I have made plenty of temperature rise  tests with cassettes. The main extrusions rarely get above 40 degrees Celsius and the front panels are typically mid thirties (barely above body temperature).

Cheers

Ian