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these are probably the best E188CC/CV4108/7308 type tube made by Mullard
depth and height
The midrange has a slight “volume” boost as everything else about the midrange remains the same and treble takes on more energy
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)
12Axx to 6SL7/6SN7 adapter will let you use common tubes like 12AX7/ECC83
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) these are probably the bestNOTE: 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
