This is some info I gleaned from AudioAsylum and thought I should pass along. Of particular interest to those using stock tubes in the MG Head or using current production tubes in other equipment.
These are Ei tubes that have been tested and selected for a low noise floor and low microphonics and have gold pins. They have been used by Marshall, the guitar amplifier manufacturer and are now offered to the public.
It looks like their are other interesting current production tubes on this site as well.
http://www.tube-shop.com/

These are Ei tubes that have been tested and selected for a low noise floor and low microphonics and have gold pins. They have been used by Marshall, the guitar amplifier manufacturer and are now offered to the public.
It looks like their are other interesting current production tubes on this site as well.
http://www.tube-shop.com/


















