Re: Difference between Celestion G12M Greenback and G12 Vintage?
I have both the Marshall and the Mesa versions. I would describe the Marshall version as having more creamy upper mids. The Mesa version is thicker sounding but not as bright. These differences are very subtle though.
There are about 5 versions of the Vintage 30, not counting 8 ohm or 16 ohm variants:
The Marshall Vintage G12, made in the UK. (originally designed as a less expensive alnico alternative)
The standard Vintage 30 now made in China.
The Mesa version Vintage 30 made in the UK. Has a different part number now, but it had during the 90s the same part number that the standard had during the 90s.
The Mode 4 version which has more low end. (don't know if it was made in UK or China)
The standard version made in the UK during the 90s.