Should I get CAT SL-1 mkII updated to mkIII?

Pal: not that much better to these ears. Fact is, I don't exactly remember what was improved... I *think* upper end extension.
An update will also mean that the unit will be checked overall, so that's an extra bonus.

I definately prefered my MK II version. Wish I had NOT upgraded.

Hi, I also had my MK II update to the MK III and I also didn't hear $700 of upgrade.

Kawika, what did the upgrade do that you din't like?

From the comments so far it seems I may do better to just retube the MKII. Any suggestions on good tubes to use. I have read that CAT preamps will eat up certain brands.

Is an upgrade from the SL1 Reference Preamplifier to a later version available and, if so, at what cost? What exactly does it entail?