Okay, on the inside of some of the original trainwreck photos you can see a strip of foam behind the preamp tube sockets. I'm assuming that's for "Dampening" the vibration around that area of the chassis. My question is--do any of you guys add this to your builds? I've been using vibration dampening rings that I found years ago and have had great success there, but I was just wondering if adding that small strip of foam would help even more in reducing the microphonics and general sensitivity of those preamp tube. Based on my knowledge from building my own amps, I would think that it honestly wouldn't do much at all...but these amps are different than any other amps out there...so who knows!? Only way to find out is to ask!
Nick Greer
"Preamp Dampening Pads"
Moderators: pompeiisneaks, Colossal
-
Tube_S_Cream
- Posts: 14
- Joined: Tue Jun 06, 2006 9:05 am
Re: "Preamp Dampening Pads"
I have used a kind of bitumen cardboard which is commonly used to dampen car doors or machine parts against vibration. The aluminium chassis easily tends to vibrate when the amp is placed on the cabinet.
After treating the chassis with this 3mm self adhesive bitumen cardboard, there is no more metall noise when knock onto the chassis.
But be careful! this seld adhesive cardboard ist sticky as hell, so it's nearly impossible to remove it, when it's placed wrong.
I really recomment dampening the ALU-chassis, especially when you place the amps on the cabinet, because vibrations from the chassis are picked up by the tubes and so you can reduce microphonic effects or any other rattling. For an efficient suppression of vibrations 1/4 to 1/3 of the inner chassis surface should be treated.
This bitumen dampening material used for automotive applications meets the requirements for a high temperature environment in a tube amp.
Some noise reduction kits for PCs may work to, but they are rather expensive and i don't know if they are working well in an enviroment of 60°C and higher. Automotive dampening cardboard does!
Greetz
Stefan
After treating the chassis with this 3mm self adhesive bitumen cardboard, there is no more metall noise when knock onto the chassis.
But be careful! this seld adhesive cardboard ist sticky as hell, so it's nearly impossible to remove it, when it's placed wrong.
I really recomment dampening the ALU-chassis, especially when you place the amps on the cabinet, because vibrations from the chassis are picked up by the tubes and so you can reduce microphonic effects or any other rattling. For an efficient suppression of vibrations 1/4 to 1/3 of the inner chassis surface should be treated.
This bitumen dampening material used for automotive applications meets the requirements for a high temperature environment in a tube amp.
Some noise reduction kits for PCs may work to, but they are rather expensive and i don't know if they are working well in an enviroment of 60°C and higher. Automotive dampening cardboard does!
Greetz
Stefan