JJ / Tesla & =C= Tube Set for a Matchless DC-30. Set Includes: Matched Quad of JJ EL84's, JJ ECC83 S/12AX7 X 3, JJ GZ34 X 1, & EF86 X 1. tubedc30 Triode, USA Customer Service M-F 9AM-4PM CT 1-800-774-3201 Email us Anytime: questions@triodestore.com