This is a write up thetubestore has... There are some important things to know about the reissue Tungsol 5881 tube before you decide to use it. The Tungsol 5881 is a 23 watt tube and is rated for a maximum plate voltage of 400Vdc. The many amplifiers that have higher plate voltage but use a tube rectifier can use the Tungsol 5881 tubes without issue. A prime example is the ’59 Bassman LTD. However it is also critical to rebias the amp heeding the 5881’s 23W rating. This will provide a vintage tone and less clean headroom. Leaving the bias set to a 6L6GC setting and/or using the Tungsol 5881 in a high voltage amp with a solid-state rectifier, will likely cause problems and are not covered by warranty. For these cases consider the Tung-sol 6L6GC-STR tubes instead. They are rated for 30 watts and 500V so they will hold up better. Their tone is quite similar to the 5881 too.
You need to just ask the guys at Dr. Z what the plate voltage is. Since it has a 5AR4 rectifier I would bet the plates are seeing around 365 volts. The EZG-50 comes with 6L6-GE power tubes and is fixed-biased at 35ma. You would need to have the amp re-biased to around 28ma. With a fixed bias amp you need to re-bias anyway when you put in a new set.
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