FS Good and NOS Tubes: I have 2 3B28 Jan tubes SN 525&526 NOS price $38; 5 Jan and GE 5R4 tubes NOS price $38; 2 RCA 816 NOS tubes price $19; 2 RCA 83 NOS tubes $45; 1 Bogen 6550 NOS tube for $40. Shipping extra. Pictures available. All tubes tested. Thanks, Charlie Hugg, K5MBX