This particular Mullard has plates with 7 notches and a hole in the centering pin. The Blackburn, UK factory code is etched in the glass.
Tube tests as new and ships in factory white box and interpack. Tube was purchased here on AA from Arthur Salvatore however the sale of the amp necessitates sale. The tube has less than 10 hours of use. No Pay Pal, checks and money orders
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