This new old stock-testing, new in box (one tube) RCA / McIntosh Matched Pair 6L6GC output tubes was tested on our Maxi Matcher 2 for shorts, gas and transconductance and tested on our Jackson 648. There were no shorts or gas. Transconductance measured:
Tube One: 20.7 milliamps / 2250 micromhos (McIntosh 6L6GC remnants stenciled on glass. McIntosh-branded but RCA-made)
Tube Two: 20.3 / 2290 (RCA & logo stenciled on base with code 62-04; faint 6L6GC stenciling still on glass)
Tubes tested with 400 volts on the plates and a bias of -48 volts. New old stock US-made 6L6s typically test with plate current from the mid-teens to
mid 30s with transconductance from around 2200 micromhos.
Tubes were also tested in our Jackson 648, Tube One: 111; Tube Two: 116 Good range is from 70-130; NOS is 90 or above. These tubes test at 111% & 116%.
Tubes have a black plate, one side halo getter, top radiator for cooler operation and longer tube life, crenelated round micas and are tight on base with no debris or rattling sounds. Sound tested in our Musical Paradise shop amp (see pics). Tube Two has an original box; Tube One comes in a white box (not original).
These tube will perform wonderful in your McIntosh Mc-30 monoblocks or Mc-40 stereo amplifier and well in guitar amps.
Tubes ship via United States Postal Service (USPS) Ground Advantage with tracking for domestic U.S. sale; Priority Mail is an option if you desire quicker
delivery. International orders ship via International Shipping.
Package weighs twelve ounces (12 oz).
Please view my store for other varieties of tubes.
Combined shipping always welcomed.
TUBES ARE GUARANTEED GOOD AND IN WORKING ORDER AT SHIPMENT. TRANSIT VIA POST CAN DAMAGE TUBES. THIS IS NO FAULT OF OURS BUT THE THIRD PARTY ENTITY THAT IS DELIVERING ITEM(S) TO YOU, I.E, USPS, UPS, FEDEX, YOUR NATIONAL CARRIER IF INTERNATIONAL, ETC. PLEASE INSURE THEM! WE CANNOT GUARANTEE FAILURES ON YOUR EQUIPMENT AFTER POWER UP AS THERE IS NO WAY TO ASCERTAIN HOW TUBES WILL INTERACT WITH YOUR ELECTRONICS; NOR IS THERE A WAY TO DETERMINE WHETHER THEY MAY HAVE FATAL FLAWS IN TUBES THEMSELVES! THESE ARE USED VACUUM TUBES AND TIME MAY HAVE TAKEN A TOLL ON THEM OVER THE MANY YEARS SINCE THEY WERE MANUFACTURED. WE CAN ONLY TEST FOR THE PARAMETERS MENTIONED ABOVE IN ONE OR MORE OF THE FOLLOWING EQUIPMENT WE USE FOR MEASURING: TV-7/U, JACKSON 648 & MAXI MATCHER 2.