Modular Tube Preamp System

[Holger]

I've recently finished a system rack and one module of my 10 HP 3 RU system.
The module contains 2 mic pre amps based on the TLA Ian Thompson-Bell has designed.
The 10 HP design allows to stuff 16 pre amps into a 19" 3 U rack or, as seen in my first attempt, to put 8 pre amps plus PSU into a 19" "Baugruppenträger".
28 + 10 HP were used for the PSU, there is a remainder of 6 HP when stuffed with 4 modules HP. Non used space is currently filled with whatever I found...

Module:

Frequency response:

Noise floor:

 

[bruno2000]

Nice!  B+ from PS or DC-DC converter on board?
Best,
Bruno2000

 

[Holger]

B+ old school from linear PSU.

 

[ruffrecords]

Very nice indeed Holger. These are the new 220mm deep modules?

Cheers

Ian

 

[Tubetec]

Nice work Holger ,
Any  links to music you have recorded with Ians system online ?
The story about the SSL owner turning pale when he heard the Krassmonster was classic ,stands to reason in alot of ways ,I'd imagine you have the equivalent of thousands of transistors for the signal to pass through in a big SSL

 

[Holger]

Very nice indeed Holger. These are the new 220mm deep modules?

Cheers

Ian

Ian, you're right.

 

[Holger]

Nice work Holger ,
Any  links to music you have recorded with Ians system online ?
The story about the SSL owner turning pale when he heard the Krassmonster was classic ,stands to reason in alot of ways ,I'd imagine you have the equivalent of thousands of transistors for the signal to pass through in a big SSL

This should be answered in another thread.

 

[skal1]

Holger look's very pro , by the way, were did you get the screw's for the front panels, do you have a part number.

cheer

skal1

 

[Holger]

Look:

https://www.reichelt.de/Baugruppentraeger/BGT-HS-2/3/index.html?ACTION=3&GROUPID=7756&ARTICLE=67858&START=0&OFFSET=16&SID=95WhfK46wQAT8AAHDhqtgb890f251c008fdb15d7175e0dccda8ec&LANGUAGE=EN

 

[ruffrecords]

Holger look's very pro , by the way, were did you get the screw's for the front panels, do you have a part number.

cheer

skal1

Most of the sub-rack manufacturers supply these but usually only as part of a sub-rack kit. Surprisingly few seem to offer the screws separately. Fischer seems to be the exception.

Cheers

Ian

 

[beatnik]

very nice

how did you connect the back ? it seems there is a pcb backplane ?

do you use an off the shelf chassis system for the sub-modules ?

 

[Holger]

I`ve designed a new backplane PCB for the system since the "old" version is 14 HP wide.
You can buy some of the module stuff from stores like www.reichelt.de
but it is also possible to buy from the manufacturer directly.

 

[Holger]

I've recently finished a second unit, this time with pushbutton switches and different transformers. 

 

[ruffrecords]

Are those the small MRK 12 way rotary switches?

Cheers

Ian

 

[emrr]

Looks great!

 

[Holger]

Are those the small MRK 12 way rotary switches?

Cheers

Ian

Ian, that's Right.

 

[Winston OBoogie]

That's a nice job you did getting it all packaged Holger, both of them 

Are you using individual pin sockets for each tube pin?  I can't see a ceramic or otherwise main body of a tube socket in the pics

 

[Fuzz Face]

Are you using individual pin sockets for each tube pin?  I can't see a ceramic or otherwise main body of a tube socket in the pics

Good catch! I didn’t notice that but it’s a great idea

 

[Holger]

...
Are you using individual pin sockets for each tube pin?
...

Yes, the pins are from Harwin, Mouser # 855-H3161-05

 

[L´Andratté]

Beautiful!
I feel local patriotism! ;D
Seriously, looks like something on par with the stuff from the broadcast studios of old...