In the second video from Tegeler Audio, Helmut shows as the Vari Tube Compressor and the 32 Channel Tube Summing Mixer. The compressor is of the variable µ (variable "mew") variety. This is a rare design choice since it can be very tough and expensive to design a good compressor of this type.

The Tube Summing Mixer is essentially a passive mix buss to bring your tracks together in the analog domain. The addition of a tube gain stage and an output transformer add the 60's sound that Tegeler works so hard to achieve.

Part 1
Part 3