The reissue Genalex Gold Lion ECC83 / B759 tube is New Sensor's modern-day effort to recreate the renowned sound signature of the vintage European original.
This Russian-made version features long ribbed plates, a dual post dish getter, and gold pins.
It has nine thin pins arranged along the circumference of a circle with a diameter of just under half of an inch.
There is a large gap between pins 1 and 9 to ensure that the tube can only be plugged in one way.
They are labeled for Hammond organs and matching Heerlen, Holland factory codes are etched in the glass. This 1960s Amperex ECC83 / 12AX7 tube was made in Holland and labeled for organ, hi-fi audio, or medical companies. The white print on the glass has the Arcturus logo.
This tube appears new in box but it tests at about 80% for Gm on both sections. This Ei ECC83 / 12AX7 tube was made in pre-war Yugoslavia and labeled for other companies.
A separate filament transformer was used on the switching box to simultaneously heat all six comparison tube filaments without overheating the amplifier's power transformer.