Why some preamps weigh 50+ lbs?

I guess my Benchmark products don’t qualify as high-end then. Preamp with HPA weighing in at 8 lbs ...

Very humble but BM LA4 / HPA4 has very low microphonics due to the fact that its PCB is physically decoupled from the metal enclosure.  Exactly high-end stuffs.

“Why do some preamps weigh as light as a feather?”

SMPS, chip volume control, light faceplate/chassis are all things that could reduce weight.  The power supply is where most of the weight is - transformers, capacitors, and IEC filters.

My Aric Audio Motherlode XL is a 2 box design (separate power supply), and weighs in at a total of 61 pounds for the pair. It also happens to be the best preamplifier I've ever heard.

The Don Sachs/Lynn Olson Raven preamp is brilliant as well, and it's one box design weighs in at just over 30 pounds.

High quality cabinets, shielding, transformers, caps, etc. weigh more

@mofojo "Why some preamps weigh 50+ lbs?"

please ask specific preamp manufacturer!

While not exactly 50 to 70 lbs, my purist preamps, yamaha C5000 (~42 lbs) & luxman c900u (~43 lbs) are not exactly lightweight gnat farts either...

I am increasingly convinced that the yamaha is the best sounding out there, not to mention it is a work of art.

I have also seen some cost no object eurocrap that is just foolery when you actually open it up...the weight alone doesn't mean much.