The bias of tubes is critical (learn more about bias) to the sound of an amplifier and the life of its tubes.
The Bias King includes directions to take simple readings for the most commonly used power tube types (6V6, 5881, 6L6, EL34 and 6550). With the Bias King, it's easy for you to keep the bias of your tubes perfectly matched. It's simple to spot fading tubes, keep your amp perfectly tuned, and always ensure your listening experience is the best it can be. Please note that the Bias King requires AC power on the tube's heaters. Most home audio amplifiers use DC power; consult your manual to confirm how your amp works.
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Warranty Information and Return Policy
Warranty Period: 3 months
All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)
If you receive a tube that does not perform to the manufacturer's specifications, please do the following:
- contact us to get a return authorization - return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.
Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.
We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.