Gates Tube Mixer Schematics

[opacheco]

The Bi-Motes that I have are M5233 ( PCB) these are the ones with the 5879's and 12AU7..

There may have also been another versions with EF86's..
The Bi-Mote was the Program Amp section of a Gatesway and or a Yard... ( with a pair of Davins , a Power supply and Enclosure)

http://vintageproaudio.com/Doc+Schematics/gatesm5233doc.jpg

As you can see this is the same PCB that is used in the Dynamote, Bimote, Yard and Gatesway...

The Yard changed from 5879 tubes to EF86 in the mid 60's I believe that I have  Bimotes with that same board .. M6142..

http://vintageproaudio.com/Doc+Schematics/m6142adoc.jpg

I have collected many Program Amp sections of the Yard and the Gatesway for the very purpose of DIY building of "UniMotes"

If  sharing (re-posting)  my posted schematics please just acknowledge where they came from or point to my URL.

Thanks and good luck
Port

Daer Port,

Do you have the schematics of the BIAMOTE mixer? The links are dead now.

Thanks anticipeted
Opacheco

 

[mjrippe]

https://web.archive.org/web/20080608193546/http://vintageproaudio.com/Doc+Schematics/

 

[opacheco]

https://web.archive.org/web/20080608193546/http://vintageproaudio.com/Doc+Schematics/

mjrippe,

Thanks a lot for the links but do you have a link for the Biamote with 2 Pentodes EF86 version?

Opacheco.

 

[mjrippe]

Not exactly, but should help...

 

[opacheco]

Not exactly, but should help...

mjrippe,
Yes I suppose!
Thanks a lot for your help!
Opacheco

 

[Andrewfrommontreal]

Wow. This is amazing. I just purchased a Gates M-5136 and was looking for the schematic. Not that I really understand it beyond seeing what is connected to what. Yes… very green. I normally give my gear to a tech to work on but I do appreciate trying to understand the tools I work with. In a basic manner, could someone explain how the four tubes function together to amplify the signal? I imagine the last tube uses both sides as a push pull. If so, how do the other three work together.

I honestly don’t get the sense that I have 90dB of gain at my fingertips. I will soon test legitimately though. Perhaps the tubes are not up to spec.