NOTE: After spending $$$$ on tooling and various prototypes, we have fitted Special Grade Flying Leads tubes with Custom Bakelite 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 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,  fitted with our Custom made Bakelite Bases (INTL Patent Application in Process).

Brand New MINT NOS NIB Rare 1959-60 BRIMAR CV4035 Box Plate Military Factory Tested* tubes. CV4035 Flying Lead is a Premium Grade, High Reliability Long Life version of ECC83/CV492/CV4004/6057/12AX7 valves (Click Here). Etched STC Rochester Plant Date Codes. Made in England. Labels are a bit fragile on these tubes since the tubes can rub against the cardboard cone inside the box.

CV4035 premium grade version of the late 1950s-early 1960s Box Plate CV492 aka CV4004 is one of the best from Brimar in the ECC83 types (click Larger Photo).

*Each tube came with a hand written individual serial number. Tubes were factory tested and serialized for some qualification (PM25526-1 CC xxx), except we don't have specific details of the qualification.

These tubes are one of a kind. No refunds, exchanges or tube rolling at our expense as it says in the Terms and Conditions on the web site.

Tested and matched on Top of the Line Calibrated Hickok 580 Lab Grade Tester recently calibrated by late Chris Haedt.

Single Tube = $100. SOLD AS SINGLES. CANNOT MATCH PAIRS DUE TO DIFFERENT PRODUCTION YEARS.

• Brand New MINT NOS NIB Rare 1959-60 BRIMAR CV4035 Box Plate Military Factory Tested tubes. CV4035 Flying Lead is Premium Grade, High Reliability Long Life version of ECC83/CV492/CV4004/6057/12AX7 valves. Etched STC Rochester Plant Date Codes. Made in Engl