The price is for 1 NOS tube with box. The tube was first opened just before I tested it and took pictures. It was made in Heerlen, Netherlands, and has etched codes WK6 𝛥7C2. The construction features a single D-getter, pinched waist, and gold pins.
Tested VERY STRONG & PERFECTLY BALANCED as follows:
Test conditions: Uf = 12.6V, Ua = 250V, Ug = -5.5V
Where good starts from Ia=4.3mA and 100% is Ia=6.0mA.
This is a super rare tube with great matched triodes!
Shipping via registered airmail with tracking number. Import fees for U.S. buyers are included in the shipping cost under the new tariff regulations. Other methods available upon request.