Penta Laboratories 572B Vintage Tube Pair for Ham Radio Final NOS (Test 107%). These are vintage 572B tubes, made by Penta Laboratories. These tubes have matching date codes, 0804. The test results are as follows.. Tube 1: 1256 (105%). Tube 2: 1299 (108%). The tube(s) in this sale have been carefully screened to ensure your satisfaction. We meticulously inspect each tube for loose parts, faded getter flashing, heat-stressed plates, and more. Furthermore, testing was performed on a professionally modified and recently calibrated Hickok 539B. The unit has been fully recapped, and all stock critical resistors have been replaced by those with 1% tolerance. A solid state power supply has been installed, and to eliminate human error, all analog meters have been replaced by digital meters. These are test results you can trust! With all of this in mind, the tube(s) in this sale include a 30-day satisfaction guarantee. More often than not, we are able to remedy the situation with direct communication. The item “Penta Laboratories 572B Vintage Tube Pair for Ham Radio Final NOS (Test 107%)” is in sale since Wednesday, December 27, 2017. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets”. The seller is “hamandhifi” and is located in 89431. This item can be shipped worldwide.
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