In my continuing quest to find a Hammarlund clock knob I ran across a website for the true purist (and masochistic) radio restoration specialist. It's a source for New Old Stock Black Beauties, wax paper caps and other unused vintage "time bombs": http://www.soundchamberrepairs.com Click on on the "Guitar Parts" or "Amp Parts" tab at the top of the page, then click on "Caps Tone". 73, Craig W3CRR