ATTENTION! Before buying this tube quartet, check that your amp supports it. This valve is 23W and supports a voltage of up to 400VDC. If your amp uses a suitable rectifier tube you will be able to use them without problems like the Fender Bassman 59 'as long as you make a suitable rebias for a vintage tone and optimal performance. If you leave the Bias enough to use the 6L6 that are not from the Tung-Sol brand (this brand is 30W and 500V) or a solid state rectifier of an amplifier with high voltages, the valve will break and will not have any type of warranty.
These 5881 are the best in their category. Low noise level and microphones and with a high level of tonal and harmonic details. Recreated almost 100% from the NOS but at a better price. When you saturate these tubes you will have the professional sound you are looking for. Great for use in Tweed Amps, JTM45 and Bassman amps.
The perfect choice.
Before shipping they are tested with an Orange Valve Tester VT-1000!