Poor Man's Tube Mixer

[ruffrecords]

Do you need to double up on the heater gnd wire as well?
- Richard

If you double up you need to do it to both heater leads. Strictly speaking neither of them is a ground.

Cheers

Ian

 

[ruffrecords]

Pictures of the latest plug in mic channel for the poor man's tube mixer. which I have just finished testing. This module has stepped mic gain, phantom/pad/line and phase switches, two band stepped REDD EQ with three frequencies per band, pan pot and two echo sends all in a 3U by 70mm wide module.

Front:



Front panel PCB rear view showing EQ inductors:



Complete module:




This version has an OEP mic transformer but there will be a version with the Sowter/Cinemage/Jensen transformer footprint instead.

Cheers

Ian

 

[ruffrecords]

It is a long time since I had anything to report on the Poor Man's Tube Mixer but the first custom build is now complete and will soon be heading for Los Angeles.




This one has four mic pres each with two band EQ with three frequencies per band , a pair of post fader echo sends and a pan as well as the usual stepped gain control and phantom, mic/line, pad and phase switches. Direct out can be switched from pre EQ to post EQ from the fader panel which also provides mute and solo switches. There are a couple of echo returns and a master section with master fader, monitor and headphones level controls plus a pair of SIFAM VU meters. Lastly there is a dual copto compressor module (linkable for stereo). PSU is external.

Backside:



Next up is another custom one with 12 line inputs.

Cheers

Ian

 

[ruffrecords]

Here is a close up:




Cheers

ian

 

[L´Andratté]

It´s making my brain melt.

What a vision, ruffrecords. I could write multiple lines of praise here, but let me just say this is the most compelling work I have seen on GDIY for some time!

(Btw. channel 3 Gain and HF knobs are swapped...)

 

[ruffrecords]

well spotted, I better fix that before I ship it. Funny thing is, the client was over here on tour last month and popped in with his band to have a play with it. Nobody noticed the swapped knobs.

Cheers

Ian

 

[My3gger]

I'm doing another project with pcb having noval tube sockets, if i want to use taller 9 pin tubes there is not enough space left for mounting into 2U chasis, it wouldn't be safe. Can these pins replace tube socket directly, or do i need another pcb:
https://uk.farnell.com/harwin/h3161-05/socket-pcb-gold-knurled-1mm/dp/149319
Datasheets for tube sockets are pretty confusing because some Chinese sockets require ~1,2mm holes, most other porcelain have ~2,1mm holes, Belton i like best have 1,6mm pins.
If necessary, could drilling additional 0,5mm be a problem?

 

[ruffrecords]

I'm doing another project with pcb having noval tube sockets, if i want to use taller 9 pin tubes there is not enough space left for mounting into 2U chasis, it wouldn't be safe. Can these pins replace tube socket directly, or do i need another pcb:
https://uk.farnell.com/harwin/h3161-05/socket-pcb-gold-knurled-1mm/dp/149319
Datasheets for tube sockets are pretty confusing because some Chinese sockets require ~1,2mm holes, most other porcelain have ~2,1mm holes, Belton i like best have 1,6mm pins.
If necessary, could drilling additional 0,5mm be a problem?

I solder them directly onto a PCB As shown below:



Cheers

Ian