This is the PCB mounting version of the widely utilised B9A socket series. This Ceramic socket has a high dielectric strength, rugged proven design and built to last a product lifetime. Ideal for use with Brimar ECC81, ECC82, ECC83, ECC804, EL84, EF80, EST15, 12AX7 12AT7, 6BQ5 etc. Great for refurb of Marshall, Hi-Watt, Fender and Vox Amps.