Passive summing just doesn't interest me.
There is a reason big desks don't do it like this.
AFA tubes and why - I like the vacuum tubes ability to deal with complex
audio material. Plus, my idea is to make a switchable to a pair of solid-state summing amps as well as the tube sum amp.
the active summing section will be built after 16 channel input.
Maybe some other tweaks like mute, insert on 2mix and transformer balanced, split stereo outputs, etc...
I just need a starting point, frame of reference to go and research and learn.
I'm not as smart as most of you. I am made of kool-aid for christs sake!
go to kubarth.com, look at "GDIY files" and then "vintage german modules" for the TAB V75 schematic
V75 (or REDD 51 was the other schemo) is just what I had been searching for.
Now, I need to learn German...
edit for questions (if anyone has a minute and more brains than me)
sorry there are so many:
(start with obvious) The V75 is a 4 in x 1 out?
the "1:10 V372", that is referring to a mic to grid, input transformer model from a V372 unit like Haufe?
Could these 'input stages' be bypassed for line level input or is it already line level load input as is?
How much gain for each of the 4 x tube 'line' amps (tubes 1-4)?
How much gain is produced post-summing point (tubes 5-6)? These are wired as inverting amps (I don't think so but I'm often wrong)?
I count: 6 X tubes (ECC88?) and 5 x Audio transformers. Are 104-107 chokes?
I guess by modifying the summing point, more lines could be added...
spinnin' and cookin'
THANK YOU AGAIN, JENSENMANN!