DUNLEE VR-6CFR

Ref. G13

This tube’s total length is 11” (27 cm), with a maximum diameter of 2.5” (6.3 cm)

It has an axial filament and dates back to the sixties or early seventies of the last century.

Technical specifications are otherwise unavailable.

I have no clear explanation for the insulated coiled wire around the tube base in continuity with the filament circuit.