Your homemade tweaks?

Loctite is one of the manufacturers that produces rope caulk. It's very easy and safe to use. All home improvement and hardware stores sell rope caulk under one brand name or another. Once you see it, you'll understand why it's so popular for damping purposes. This stuff was all the rage twenty or thirty years ago. I still use it on my equipment rake to reduce ringing.

Corazon, I apply caulk to the cap and the pcb, so that they are both "attached" together. Interestingly, I learned this many many years ago from a tech I knew who worked at Nakamichi, but later found that this was done on many speaker crossover assemblies. I have been doing it ever since, and I will tell you, it has been drastic in the improvements. The caulk is removable if you ever wish to remove it. It is critical that the caulk is given enough time to dry, as to not short anything out. I did have a Citation 12 blow up on me because I lacked patience(again, a very long time ago).

I have looked at the photos, and the caulk I prefer to use is not the rope caulk, but that in the tube. My recent projects have been using GE Silicone 11, clear, available at the Depot. Rope caulk never completely dries and is harder to remove. It also will capture dust. Rope caulk is very useful in the corners and such, though, but I prefer the tubed stuff all the way. My biggest success with rope caulk(besides room air conditioner seal)was the underside of direct drive turntable platters. However I need to point out that several turntables used a magnetic tape head underneath, so caution is advised.

That was my McCormack for sale. Please notice that the Moretite on the caps is around the bottom, where they attach to the board. This helps bond them to the board without glue and makes their physical placement firmer and more stable, resulting in less vibrational movement than without that bonding. Of course you could also use glue, but then good luck ever getting them out again.

As for the chassis, well, that's obviously a place to dampen things, expecially the top and bottom panels with the biggest surface area. If you look close you will also see a blue piece of EAR Isodamp under the transformer. Transformers are an obvious source of vibrations and damping it in any way possible should reward the effort. Some better units also use damped standoffs for their board mounting. They have little rubber-like grommets to do this. I know my Audioprism Mantissa preamp has those on it.

Is all of this audible? Individually, I doubt it, but combined all together I think you will hear an improvement.

Enjoy,
Bob

Each and every step you take is audible. I agree, the transformer is a great place to isolate vibrations, as well as the boards themselves. Years and years of trial, error (HK12)and patience have brought things to another level. Many of my friends and associates agree. These tweaks are not snake oil.......