I do not know how good these tubes are. They have never been tested. All are in a box. Make offer for the entire lot plus shipping. 6gu7 6ea8 6al5 6bq5 6ah6 12by7a 6gf7a 6ag5 6ka8 6gy6/6gx6 6ds4/6cw4 6an8a 6be6 6al5 6cg8a 6fq7/6cg7 6kz8 New in Box-6gk6 73 john n4dsp