No need to spend $150> on a 0.50cent re-badged fuse save your money Bruce, just replace it with a new same 0.50cent one, from Bussman or Littlefuses.
What you most likely heard was a fuse that’s seen too many turn on cycles, they get fatigued and hardened and build up crusty deposits , like these have with too many turn on cycles.
Left to right https://ibb.co/G9XGH8Y
Right to left https://ibb.co/b5dz1q5
And you should ask admin to move this thread to the Misc Audio forum
Cheers George