> The "good" tubes are JAN (Joint Army Navy) tubes which were last produced in the 1960s.
s/1960s/1980s
Sylvania was still making them up to 1981, when Philips ECG bought the Sylvania tube factory so they could supply the US military. They continued making JAN tubes until 1988. A lot of these are still available.
s/1960s/1980s
Sylvania was still making them up to 1981, when Philips ECG bought the Sylvania tube factory so they could supply the US military. They continued making JAN tubes until 1988. A lot of these are still available.