Pulse Tubes Store

MULLARD CV4033 - Very rare 1958 - Mil wrinkle glass, Halo GT. - Whyteleafe "A" Production Prem. Grade Long Life ECC81:CV4024:12AT7 Factory Tested (Plug&Play Ready to Use)

Sale price Price $120.00

We have 10 in stock.
Regular price Unit price  per 

Shipping calculated at checkout.
NOTE: 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 New MINT NOS NIB Very Rare 1958 MULLARD CV4033 wrinkle glass Military tubes from Whyteleafe "A" factory. Factory tested and serialized*. 

CV4033 Flying Lead is a Premium Grade, High Reliability Long Life version of CV4024/ECC81/12AT7 valves (Click here) - CV4033 premium grade version of the Black Plate CV4024 is one of the finest from Mullard in the ECC81 types. Mullard Whyteleafe "A" Plant Date Codes. Made in England. 

*Some tubes may came with factory stickers (See Photos). A hand written individual serial number on top, and a printed sticker with numbers R811451 PM25525-1 on the side. Another hand written serial number on the side and text PM25525-1. Another sticker with text PM25525-1 is attached on the back flap of the tube boxes. NOTE: Top circular sticker is missing on a few tubes - old adhesive is very flaky and these must have come off at some time in last 50+ years.

Tubes were factory tested and serialized for some qualification (R811451 PM25525-1), except we don't have specific details of the qualification. 

Tested and precision matched in house.

Single Tube = $120. Select 2 for a Matched Pair or 4 for a Matched Quad.
Even odd number of tubes will be matched before shipping.