eBay

Rare Platinum Matched Pair of Sylvania 3-Hole Bad Boy Plate JAN-CHS 6SN7WGTA NOS Tubes, Military Specs, Extra Supporting Rod between Plates, Bad Boy Style 3-Hole T-Plates, Chrome Dome. These NOS Sylvania 6SN7WGTA tubes are great sounding tubes.

Date Codes:
304A (tube was manufactured in the 4th week of 1953 by Sylvania)
5534B (tube was manufactured in the 34th week of 1955 by Sylvania)

WGTA is the suffix for military tubes, and JAN means Joint Army Navy, so both tubes were manufactured by Sylvania for the U.S. military according to strict military specs.

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: 109 / 109

Tube 2 Gm: 109 / 112

* Minimum good for 6SN7 tubes on TV-7D/U is 50 (65% of NOS), so

    Below 50 = Low testing tubes
    50 - 77 = Good tubes
    77 and above = NOS tubes

So these two tubes are very strong, way above the NOS level. Also, tubes are Platinum Matched, tightly within 3% of mutual conductance.

No shorts, no leakage, no gas, no loose base.

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 and tube pins have been thoroughly cleaned before plugging into our tube testers and tube amps, so they are ready to use right out of the box.

Tubes will come with vintage 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.