I have 3 Herbie tube dampers. They are the Ultrasonic 9 Audio Tube dampers suitable for the following: Fits miniature 9-pin tubes and all tubes 3/4" to 7/8" diameter (19mm to 22mm), including 10GV8, 12AT7/ECC81, 12AU7/ECC82, 12AX7/ECC83, 12AY7, 12AZ7, 12B4, 12BH7, 12BY7, 12BZ7, 12FQ7, 2C51/396, 417, 5670, 5687, 5751, 5814, 5842, 5963, 6189, 6201, 6267, 6350, 6414, 6688, 6829, 6840, 6900, 6922, 6955, 6973, 6AN8, 6BL8, 6BM8/ECL82, 6BQ5/EL84, 6BQ7, 6BW4, 6CA4, 6C45, 6CG7, 6CS7, 6DE7, 6DJ8/ECC88, 6E5P/6E5PI, 6EJ7, 6FQ7, 6GC7, 6GH8(A), 6H30, 6GU7, 6N1P, 6N30, 6N30P, 6N3P, 6N6(P), 6P1, 6S19P, 6U8(A), 6V4, 7025, 7044, 7119/E182CC, 7189, 7199, 7308, 8416, E80CC, EC86, ECC189, ECC81, ECC82, ECC83, ECC85, ECC86, ECC99, ECL86, EF184, EF86, EL84, EL86, EZ80, EZ81, PCC88, PCL82, PCL86, SV83. [URL]http://herbiesaudiolab.home.att.net/ultra.htm[/URL] I bought them in May this year, and for the three + £12.42 duty, VAT and Royal Mail handling charge. I am looking for £25 + postage at cost for the three.