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Duende Criatura Tube Dampers for 19,5-22 mm tubes Per stuk
Article code: 2003
The problem - the solution
The principle is simple. We all know tubes are microphonic in some way. Microphonics means acoustic coupling excists to the sensitive inside parts of the tube. There are two mechanical paths for that:
1) Direct path: Loudspeakers -> air -> tube glass -> tube mica ->tube plates -> tube grid. And...tube grids are very microphonic, because here is where the signal amplification takes place. The idea with tube dampers is, when you make the tube glass heavier, and also add some damping to it, you'll reduce the microphonic effects. The damping comes from the softness of the Teflon. It seems ideal audio material.
2) Indirect path: Loudspeakers -> air -> amplifier deck -> tube sockets -> tube pins -> tube grid. This type of microphony is best stopped by using the Yamamoto Telfon sockets. So you avoid the mechanical waves to enter the glass. Without Teflon sockets, some good part is still absorbed by tube dampers also. (for Yamamoto, see menu of this website).
A problem may also come from mechanical transformer hum, guided through the chassis. Both Teflon sockets, and tube dampers will help against this.
The tube dampers are CNC made, in Holland by Duende Criatura. They are made from a solid block of Teflon, with a working temperature of maximum 260°C. This material has no burning effects at all. Teflon is a self-cleaning material, and no dust or colorization will stick to it. They have a spring around them of Titanium, which is a so called "hard metal" and it is surprizingly flexible.