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5u4

  1. MartyGee666

    Directly heated rectifiers

    Heyo, I'm working with 5U4 rectifier tube, and I'm getting close to 100v AC on the rectifier heaters. With no tubes I'm getting 3.5v on the power and pre-amp tubes, but the rectifier, is way out of spec from the 5v I believe I should be getting. Is there something I'm missing, it being a...
    • MartyGee666
    • Thread
    • 5u4 directly heated heaters rectifier tube
    • Replies: 16
    • Forum: Tube Audio
  2. angelaudio

    5V4 good substitute for 5U4 in an MC30?

    Was told that the 5V4 tube takes a little longer to ‘warm up’ and doesn’t send voltage ‘downstream’ as fast as the 5U4 therefore it would be ‘healthier’ for the amp and ‘prolong’ the life of internal components. A lot of quotation marks in that statement, I apologize. I’m new to tubes so my...
  3. Raytheon 5u4

    Raytheon 5u4

    After much tube rolling, this particular Raytheon 5u4 is my overall favorite in the Moth s45
    • MikE
    • Media item
    • 5u4 raytheon
    • Comments: 1
    • Category: Tube Gallery
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