BRIMAR CV4033 - Rare 1957 - Mil Black Plate, 3-MICA Halo GT. - STC Footscray Production Prem. Grade Long Life ECC81:CV4024:12AT7 Factory Tested (Plug&Play Ready to Use) The above are my impressions

The above are my impressions using the Monolith Liquid Platinum by Alex Cavalli

NOTE: After spending $$$$ on tooling and various prototypes

CV4035 M8214 premium grade version of the 1960s Box Plate M8137/CV4004 is one of the best from Mullard in the ECC83 types

This 12AU7 variant has black plates with a single connected joint

*Each tube came with 3 factory stickers (See Photos)

BRIMAR CV4033 - Rare 1957 - Mil Black Plate, 3-MICA Halo GT. - STC Footscray Production Prem. Grade Long Life ECC81:CV4024:12AT7 Factory Tested (Plug&Play Ready to Use) The above are my impressionsNOTE: After spending $$$$ on tooling and various prototypes, we have fitted Special Grade Flying Leads tubes with Custom Thermo setting Bases developed in house. It is a multi step, labor intensive process. Each lead is straightened and cleaned to ensure perfect fusion with the base pins in the silver soldering bath. Process is painstakingly slow, so we will be adding a few tubes at a time to the inventory. Tubes are Plug & Play, Ready to Use. Brand