• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Matsushita ECC85/6AQ8

If I remember correctly, the 45 year old AU-111 that came to me had one in it that was fine. Was it the same one that the factory fitted ? I don't know, but I'd guess it was. Same with the 12BH7's in there. Similar with other Sansui with lots of NEC tubes that had probably been in there for 40-50 years. Convinced me that Japan made reliable tubes.
 
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