Amperex Tube Codes at Henry Jeffries blog

Amperex Tube Codes. The codes are written in two lines on standard tubes and in two rows on special tubes (as e88cc) on the glass close to the base. Tubes manufactured during the late 1960s into the 70s were marked with the engineering change code ‘i63’. For the date code shown in the picture, the ‘9’ indicates either 1969 or 1979 depending on the change code. Most philips valves are marked with a group of symbols which contain coded information relating to the type,. Eia codes you might find on a tube. Great resource to have when the original logo is gone or you have a generic logo (remarketed). The third character indicates the month of. A great tube for audio or guitar. The second character indicates the year of manufacture. You can find this tube by the etched mc6 code, along with the herleen delta symbol + one number.

Mullard Blackburn (marked Amperex) 7189A Tubes, Matched Quad, Tested
from www.usaudiomart.com

Most philips valves are marked with a group of symbols which contain coded information relating to the type,. Tubes manufactured during the late 1960s into the 70s were marked with the engineering change code ‘i63’. You can find this tube by the etched mc6 code, along with the herleen delta symbol + one number. The second character indicates the year of manufacture. The codes are written in two lines on standard tubes and in two rows on special tubes (as e88cc) on the glass close to the base. A great tube for audio or guitar. The third character indicates the month of. Great resource to have when the original logo is gone or you have a generic logo (remarketed). For the date code shown in the picture, the ‘9’ indicates either 1969 or 1979 depending on the change code. Eia codes you might find on a tube.

Mullard Blackburn (marked Amperex) 7189A Tubes, Matched Quad, Tested

Amperex Tube Codes Tubes manufactured during the late 1960s into the 70s were marked with the engineering change code ‘i63’. A great tube for audio or guitar. For the date code shown in the picture, the ‘9’ indicates either 1969 or 1979 depending on the change code. Most philips valves are marked with a group of symbols which contain coded information relating to the type,. Great resource to have when the original logo is gone or you have a generic logo (remarketed). The second character indicates the year of manufacture. Eia codes you might find on a tube. The codes are written in two lines on standard tubes and in two rows on special tubes (as e88cc) on the glass close to the base. Tubes manufactured during the late 1960s into the 70s were marked with the engineering change code ‘i63’. The third character indicates the month of. You can find this tube by the etched mc6 code, along with the herleen delta symbol + one number.

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