DC fuse mini moog D?

Ok so I was doing a setup in a studio and I left my model D on for a while with it in self ossoliating mode. (so I could tell what inputs on my mixer were routing to where)

Ok fuse blew and I replaced it.

its 1/4 AMP DC. I had a spare in my Prophet 600.

~Question~

  1. Ok do I really pay $10 for a fuse?
  2. Also is keeping it self ossolating the reason it went out? Its a new moog to me, just played it so far 10x only in 7 months.