All JAN tubes, were made in the USA. That was a big reason Phillips moved a factory, to America. The USN-CEP, indicates that is was JAN, made specifically for the US Navy specification. The etched codes, indicates origin, construction, model, and authorization(acceptance)no.
They should be extremely suitable for phono sections, as this was a selected 6922, based on noise, section matching, failure rate, and on spec. longevity, to name a few.
They should be extremely suitable for phono sections, as this was a selected 6922, based on noise, section matching, failure rate, and on spec. longevity, to name a few.