YOU ARE PURCHASING ONE LOT OF TWO HAM RADIO CRYSTALS IN THE FT-243 STYLE HOLDERS, 3985 AND 7285 KHZ. I HAVE INSTALLED THE HC49/U TALL VERSIONS OF THE HC49 TYPE CRYSTALS IN THE HOLDER CAVITY. THESE ARE USEFUL FOR POPULAR AM FREQUENCIES.
I SOMETIMES FIND THAT THE SMALLER HC49/S CRYSTALS WILL WIMP OUT IN VACUUM TUBE CIRCUITS, BUT THE LARGER HC49/U WORKS GREAT IN MY ONE TUBE TV SWEEP TUBE (50CD6) CW TRANSMITTER. IN MY TRANSMITTER, WHICH RUNS ABOUT 100 MA PLATE CURRENT, THEY WORK JUST AS GOOD AS THE FT-243 WITH A STANDARD CRYSTAL ELEMENT.