Thanks for the heads up Matt. I'll hold off on the spring mod until we figure out if the cheap pen springs are safe or not. Anyone know if medical grade stainless steel springs exist?Yeah I've done the spring mod, and it works great. Did it both with poly fill and the blue foam plug. The only reason I'm not using it now was because of some discussion of the galvanizing material flaking off, and of the metal underneath rusting.
I will try this mod as well when my syringe arrives (on order).I'm using the ZFM mod (zero-filler mod) with excellent results. You need a drinking straw, a cart cap (sometimes called a cart condom) and an xacto knife. Perfect vapor for a long time, although refilling is best with a syringe, so there is an inconventience, but one can make and fill several carts to use throughout the day.
Ding Ding! We have a winner! Yes that is my Pioneer SX-750 Receiver I beleive from 1976. I love tubes too. Kurt check your PM's.BTW, love the avatar. I restore vintage audio electronics as a hobby, and spin vinyl often. I particularly like the late '50s and early '60s tube gear. I am guessing the avatar is a Pioneer from the mid 70s, maybe Sansui. Fun stuff!