MontanaWay wrote:tubes4hifi wrote:aren't you guys still having transformer contact the chassis when using these thin rubber washers?
I use 1/8" sorbothane under the transformers, and then use the neoprene washers.
Sometimes easier to find (or maybe the same) are fiber (fibre) washers, made of a semi-hard material, like dense cardboard,
usually easy to find in any hardware store. Lots of sorbothane on ebay.
Cut one of these in 4 pieces for your transformers
if as a previous post suggested, you use a beveled washer on the bottom/inside the chassis, flat washer on top of the chassis, that pretty much isolates the transformer from the chassis. Once you tighten the nut, the beveled washer gets squeezed up through the chassis hole and makes contact with the top washer. I would also use a washer under the beveled washer so that the nut does not damage it.
I ended up using flat as well as bevelled washers for the transformer on my custom SP9, it seems to work really well, the screws nor the transformer are making any contact with the chassis.
I also used s/steel washers under the bevelled washer so that the nut would not bite into the rubber.