Egnater Tweaker 40 Plate Voltage

  • Thread starter Thread starter Strat1953
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Strat1953

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I was offered up a pair of Tung Sol 5881's rated at around 23 watts but the max plate voltage for these is only 400Vdc . I'm thinking this would be an issue as I understand the Tweaker 40's plate voltage is in the ballpark of 450Vdc ?? Also , if possible to use these would the recommended bias value of 65mVDC still apply ?

Thanks
 
Hi Strat1953,

Closer to 435 VDC for the Plates at 65 mV. Are these tubes RI (new manufacture) or originals? The originals can probably handle the higher Plate volts, and 65 mV would be about right for the bias, putting them at about 60%. The RI tubes might not work with higher Plate volts in a SS rectified amp.

From TheTubeStore:
"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."
 
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