Rare Platinum Matched Pair of NOS RCA 12BH7A Tubes for McIntosh MC30 MC240 MC275

Description: Rare Platinum Matched Pair of NOS RCA 12BH7A Tubes for McIntosh MC30 / MC240 / MC275 and other amps, Black Plates, Square-Getter with Foil Strip, White Print (smudged), Matching Date Codes, made in the 1950's, tested way above NOS level. These RCA 12BH7A NOS tubes are great sounding tubes. Date Code:5-56 on the box (Tube was manufactured in May, 1956 by RCA)5-56 on the box (Tube was manufactured in May, 1956 by RCA) This platinum matched pair of early RCA 12BH7A tubes is a rare find for audiophiles and collectors alike. Made in the United States, these NOS tubes have square-getter with foil strip, and are in excellent working condition. RCA is synonymous with quality, and these tubes are no exception. With their unique build quality, they are sure to enhance the performance of any vintage audio or video equipment. Don't miss out on the chance to own a piece of electronic history. Tubes have been tested on our military TV-7D/U mutual conductance (Gm) tube tester, which was recently restored and calibrated by Dan Nelson - the King of TV-7 series tube tester restoration and calibration. TV-7D/U test results (also refer to photos for measurements): Tube 1 Gm: 79 / 84 Tube 2 Gm: 82 / 78 * Minimum good for 12BH7A tubes on TV-7D/U is 30 (65% of NOS), so Below 30 = Low testing tubes 30 - 46 = Good tubes 46 and above = NOS tubes So these two tubes are very strong, way above the NOS level. Also, tubes are Platinum Matched, tightly within 8% of mutual conductance. No shorts, no leakage, no gas. Tubes also have been sound-tested on our modded Dark Voice 336SE headphone amplifier. They sound fantastic, no microphonics, no hissing / crackling / or other noises. Background is dead quiet. Tubes will come with original vintage RCA tube boxes. Shipping: Tubes will be shipped by Canada Post Small Packet by Air, unless otherwise specified. It normally takes 5 - 10 days to get to US addresses (2 days within Canada, 1 - 3 days to cross the border, and 2 - 5 days within US via USPS Priority Mail). Shipping fee to Canadian addresses is US$15. Combined Shipping is welcome, if multiple items are purchased. If items have been paid separately, we will automatically refund any savings from Combined Shipping. International Buyers - Please Note: Currently, these tubes are ONLY available to folks in USA, Canada, UK, Ireland, Germany, Austria, France, Switzerland, Belgium, Netherlands, Sweden, Norway, Denmark, Iceland, Finland, Australia, New Zealand, and Japan. Folks in other countries please inquire first before hitting the BUY button. No shipping to China, India, Indonesia, Vietnam, Italy, Russia, and so on due to lots of reports on lost packages at customs. Return Policies: Returns will be accepted within 14 days of delivery, provided tubes are in their original conditions - no damages to tubes, factory tube boxes (if there are), or print on tubes; no drops in tube mutual conductance (to prevent abuse); and no removal of our unique stamp on tube glass.Buyer pays for the return shipping cost.Our purpose here is to sell tubes instead of loaning tubes for rolling. To discourage tube trial there will be a 10% restocking fee. Serious buyer only!Please contact us first before initiating a return to discuss concerns and solutions. All our tubes will be imprinted with our unique stamp on the glass. Please do NOT remove the stamp, or else tubes will not be considered ours and return will be denied.

Price: 259.99 USD

Location: Ontario

End Time: 2024-11-04T21:27:25.000Z

Shipping Cost: 8 USD