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Using these in an Eico ST-40 and they sound almost as good as old Westinghouse ones. Even biased on the hot side they have no problems with red plating. They have very good bass response and overall are about 90% of the $$$$ NOS 7591. I recommend these for hifi use, and in a cathode biased amplifier they work with no changes to the circuit. For less than a quarter of the cost of NOS tubes you can't beat them, although they have the bigger bottles, not a problem in the Eico.
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