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12at7

  1. R

    Looking for Fosgate Signature Phono Stage Schematic.

    Hello everyone! Has anyone here worked with the discontinued Fosgate Signature Phono Stage? I'm currently searching for the complete schematic diagram of this tube-based phono preamp, either available for download or purchase. I'm deeply interested in studying, restoring, or even possibly...
    • RJA_LEBANON
    • Thread
    • 12at7 12ax7 ecc81 ecc83 fosgate jw fosgate musical surroundings phono preamp phono stage riaa
    • Replies: 1
    • Forum: Tube Audio
  2. A

    Siemens ecc801s identity

    Hi guys, Happened to find these babies in my collections and wondering of the followings: 1. Are they really made by Siemens and when? 2. Searching a lot of similar Siemens ecc801s but never saw one with the same structure, namely diagonal support of halo getter??? short grey plate with 2...
  3. A

    Codename Revolver

    This EL34 single-ended valve amplifier has been a labour of Love for me. I handcrafted it using the best components I could afford. All wiring is done point-to-point. I also did the copper metalwork and woodwork myself, except for the volume knob and feet. The amplifier is switchable between...
    • Ajay-L
    • Thread
    • 12at7 diy el34 pentode triode single ended tube amp valve amp
    • Replies: 14
    • Forum: DIY
  4. oztayls

    What make of tube is this 6201?

    I have a pair of these in plain boxes. All I know about them is they are 12AT7 equivalent. the only marking on the tube is USA followed by a triangle shape and the numerals 6201 at the top.
  5. angelaudio

    Can I use a 12AT7 tube in place of a 12AU7 ?

    I have a 12au7 in my MC30 already but I’m just curious to see if the 12at7 would change the sound at all. Thanks in advance
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