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.

From the same lot of Item 2040M, these tubes have IMPERFECT TEST SCORES (either one triode is lower than average or twin triodes are not a close match). Should still work fine in many applications. Sold only as singles. 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 1970-71 BRIMAR CV4033 Black Plate with Copper Grid Post Military tubes. CV4033 Flying Lead is a Premium Grade, High Reliability Long Life version of CV4024/ECC81/12AT7 valves (Click Here). STC Rochester Plant Date Codes are faint and painted on instead of etching in Brimar flying lead type, and may not be visible on all tubes.

 

Various dated acceptance stamps on the boxes are NOT the date codes and may be of later date. Made in England. Labels are a bit fragile on these tubes since the tubes can rub against the cardboard cone inside the box.

CV4033 premium grade version of the 1960s Black Plate CV4024/6060 is one of the best from Brimar in the ECC81 types (click Larger Photo).

Tested and matched on Hickok 752, just recently calibrated and modified by Hickok expert to all Solid State to eliminate drift. However, on average 12AT7 measures lower on this 752 than it should.

For comparison, 12AT7 measuring 4400-4400 on calibrated Hickok 600 measures 3300-3300 mmhos on this 752. Average new 12AT7 on Hickok 600 is 4000 mmhos. In other words, actual test scores are higher than what we have noted on the tube boxes.

Single Tube = $30.