One matched pair only. This matched pair has less than 20 hours on them. I played them to make certain they were working. They still need to be broken-in. Priced well below "wholesale" and sold "as-is".These are the "X" version, and extremely rare now, having been discontinued years ago. They were designed to handle higher voltages than ordinary 300B tubes. They were designed for 500 volts, and maybe more. Fabulous performance and built like "battleships". They sounded superb with the Golden Tube 300B amplifier, but they did NOT work with the Coincident Frankenstein amplifiers. (If they did, I would be keeping them for myself.) I don't understand why, but I assume they must require higher voltages and bias, so I can NOT guarantee that they will work with any particular amplifier, with the one exception of the already mentioned Golden Tube. No Paypal.
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