Yesterday vintage NOS Japanese
NEC 6bq5 (EL84)
power tubes replaced Russian power tubes
in this Luxman integrated amp. We were shocked by the difference! Luxman stock tubes are branded Luxman, but in fact it’s modern Russian tubes.
Japanese tubes from NEC (made in the 70’s for hi-fi audio) are much quieter, the resolution is much higher, I never tried them before (tubes were sealed in the boxes), it was a blind deal for me long time ago, I don’t even have an amp with EL84 anymore, but a friend purchased Luxman from me few years ago.
After an evening of listening we are all (4 of us) came to conclusion that an old Japanese NEC is killing New Russian tube. So the NEC green series is amazing power tube.
My advice is to look for a NOS tubes instead of Russian or Chinese tubes.