[Elecraft] Buzzy K2 speaker

[gwwhatley at juno.com]

My K2 had a very irritating buzz (sympathetic vibration) at about 400 hz.  I noticed if I pressed on the top cover, it quit.  No amount of adjusting the four speaker mounting screws worked.  That ruled out the speaker itself, I reckoned.  So, I took the top off, turned it upside down and put pieces of "Q Pad around the speaker, covering most of the vacant area.   Hot dog!   Buzz went away.  
 
Q Pads are +/- 3/32 inch thick fibrous pads with one sticky side, are used in cars to quieten vibrating panels and can be found at professional auto paint stores.  Used 'em on my old Ford diesel and quietened it down.  CAVEAT:  Since the pads are kinda heavy, and are hanging from the top panel, I can't vouch for how long they will stay stuck.  They did stay stuck to the bottom of my old diesel's oil pan for years and may still be there.  I traded the truck.   However, they work so well if they drop down, I will figure some way to hold em up.  My ohmmeter says they are nonconductive.  The pads come in packs of several roughly 10" sq pads.  Maybe a friendly hot rod shop would sell just one, which is more than enough area.
 
Another idea is to affix 1/8 in thick aluminum pieces with contact cement.
 
73 from N4YM, George