Type 6HD7 vacuum radio tubes available, tested

These used tubes have been tested on a calibrated Hickok 752. All tubes are tested for transconductance, internal shorts, defective internal elements, and gas leakage. Based on appearance, and overall condition I believe these tubes are used, however their test results indicate they are quite capable of being used again with confidence. All tubes are tested with approximately 150VDC plate voltage, or in the case of specialty tubes, the voltages recommended. Values for transconductance tests are written on each box. All tubes must exceed accepted minimum Gm values by at least ten percent is order to even be considered for sale, tubes failing to make this standard are destroyed. Tubes still retaining their original box are sold in that box, tubes without original boxes are repackaged in plain white boxes. My stock of tubes is updated and replenished about twice a month. To fill orders I always select the best available from on hand stock. Price is for one tube. All tubes are sold with a money back guarantee. I will combine items purchased and paid for on the same day to help you save on shipping charges. DOMESTIC SALES: The minimum shipping charge for any purchase is $7.00. Please add fifty cents for each additional tube. INTERNATIONAL SALES: For international sales the minimum shipping charge for any purchase is $10.00. For quantities above one tube please include an additional $1.00 per tube. IMPORTANT NOTE: While these costs will cover most locations in the world, it doesn't cover all of them. If shipping to your location exceeds these amounts I will add the additional costs to your order, but give you the option to cancel the order if shipping charges push total costs beyond your budget. Shipments to Italy will be charged an extra fee for Delivery Confirmation/Proof of Delivery, sorry my Italian friends, but too many packages have been "lost" in Italy. I do not sell any tubes that fail to meet standards, these tubes are crushed and their recyclable materials recovered. I do not sell old tube boxes, old boxes are trashed. I believe the tubes that have outlived their usefulness should be completely removed from the general supply and not resold under deliberately deceptive conditions. I want my customers to buy with confidence and assurance that they are getting a quality product, at a fair price, every time. I strive to sell only the very best new, NOS, NIB and used tubes. I personally test ever one of them, because I want your business today, and, I want it tomorrow.

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