Tubes; all tested; return if not happy. 6x STR4B32 (872SS). $10/ea 3x 836. $5/ea 2x 837. $3/ea 4x 872A. $10/ea 4x 813. $15/ea 2x 866A. $7/ea 2x 5514. $20/ea 1x 4D32. $10 (NIB) 8x 807. $5/ea 2x 7027A. $15/ea … plus USPS