One Dynaco Mark 3/Mark 2 blank upgrade board and instructions only (no parts). Each amplifier requires one board. MADE IN USA. mk3boardonly Instructions Pages 1-12 Instructions Pages 13-22 Mark 2, 3, & 4 Appendix Triode, USA Customer Service M-F 9AM-4PM CT 1-800-774-3201 Email us Anytime: questions@triodestore.com