- Warszawa, MAZOWIECKIE, Poland
- Jun 13th
Matched Pair (2 tubes) of NOS MELZ metal base 6N9S - 6SL7 - 5691 These are pretty rare and beautiful sounding 6SL7 tubes great value for the price In my personal opinion they are one of the best sounding 6SL7 even in comparison with RCA red base 5691, Swedish STANDARD 33S29B I have compared all these tubes by my own and MELZ 6N9S are in a row with the above tubes. great low frequency, very low and solid bass, pleasure sounding tubes for long hours of listening.