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Great tubes for the price but problem with matching.
Ordered them last year and they were sitting on the shelf for a while. I ordered a matched pair and the test values on the labels are identical, but different in real life. 485 volts on a plate, one was drawing 28mA and the other 36mA. After adjusting the bias hotter, 33mA and 41mA(16W and 19,9W). Double checked the voltages and switched places to be sure there is no problem with the amp.
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Raportoi ongelmasta