Here are four 2A3s: two strong, one good and one questionable 2A3. Why is one questionable, you ask. Because only one half of the tube's filament lights up; even though it does test strong. The good ones are labelled Cunningham, Emerson, and RCA but all are of RCA manufacture. The "questionable" tube is an etched base Sylvania with top springs on the mica near the filaments. The Cunningham, with cool looking side micas, tests like a new tube. On my trusty Hickok transconductance tube tester, a test result of 1900 represents a 65% good tube. New 2A3 tubes read over 2900 on this tester. The strong Cunningham, with cool looking side micas, tested at 3400. The good RCA tube, also with the cool side micas, tested at 2250. The strong Emerson tube tested at 2800. The Sylvania tube tested at 2600 but remember only one half of the Sylvania filament lit. The strong tubes worked well on my homebrew amp. Typical of these power tubes, these good 2A3s ran with a light blue glow inside the bottles when tried in my amps. They ran solidly for a few hours with no sparking and no weird noises. If you shake the good Emerson tube and look closely inside, you might see a few very small, loose white specks inside the glass. There are no loose bases. The tubes seem to run reliably but I cannot guarantee the longevity of any of these tubes. No boxes are included, but these tubes will be packed very securely and cushioned to survive the trip worldwide. So, for the price, you get three good usable RCA type 2A3 tubes and one questionable but usable Sylvania 2A3 tube.
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