The New Synergistic Research Purple Fuses

@ted_denney 

Not wanting to start any debate, and I don't remember seeing it discussed before, can you without giving away any product confidential information relate what makes the fuses directional?

 A member no longer on A'gon would say that it was because all wire, including in fuses, is directional due to the extruding process.  Hoping you can shed some light on this.

I certainly could use a little help.

I have a Copland CTA 305 tube preamp made in Denmark.  There is nothing in the manual or online about fuse values.  I took out the two fuses and wrote down the values as:

T2L 250v

T1AL: 250v

I don't see anything near these on aftermarket fuses for sale.  Can someone relate these values to SR fuse values?

Thanks

@bugredmachine 

Thank you very much for the above information, it certainly helps.  Regarding physical size, the fuses are 5x20mm,