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vacuum tube

  1. knotscott

    Hagerman Cornet 3 Phono Stage Build

    My latest system project and upgrade is a Hagerman Cornet 3 tube phono stage I built from a blank circuit board purchased directly from Hagerman. It replaces a very good Hagerman Bugle 3 that I modified a couple of years ago. It features a 12AU7 and two 12AX7s, cathode Class A gain stages with...
  2. artsybob

    Friend Bought Magnavox Console...Amp Is Missing!

    My friend, who wanted a neat vintage stereo console to put into his house, bought what he thought was a Magnavox console in good shape that just needed a little restoration work. When he got it home and showed me the pictures, I told him it was missing its power amp! Not only that but it's...
    • artsybob
    • Thread
    • magnavox stereo console vacuum tube
    • Replies: 18
    • Forum: Tube Audio
  3. V

    Please, help to recognize these speakers

    Hello, Do you recognize these brown vintage speakers and have any info about them? There are no markings or stamps in them. The speakers sound good and withstand quite loud playing. The speakers are 10 inch and are attached to an old Finnish made tube radio made by Salora in 1953-54. Thanks...
    • -Ville-
    • Thread
    • speakers tube radio vacuum tube vintage
    • Replies: 0
    • Forum: Speakers
  4. marantzgrail

    Rogers Tube HELP! 6H6M

    Good day all! I have purchased a large number of tubes over the past many years, I've forgotten about one in particular that I have quite a few in NOS shape, with a black steel casing that is rough is rough to the touch... even the packaging is mint! These radio tubes are made by Rogers after...
  5. artsybob

    Pioneer Made My Realistic Tube Amp?

    When I first bought my Realistic SAF-40D integrated amp , I had thought maybe Trio-Kenwood had built my amp after looking through threads on here and other sites. Although Radio Shack kept their amp supplier a mystery, some compared the amp's topology to that of contemporary Kenwood amps. But...
    • artsybob
    • Thread
    • integrated amp japanese pioneer realistic saf-40d sm-83 tube vacuum tube
    • Replies: 11
    • Forum: Tube Audio
  6. Tubeglowpio

    Anyone uses tube guards?

    Have thought about using tube guards in a build but always wondered how you would switched the tubes out? Would you have to flip the amp and remove the nut then pull the guard off, swap tubes and put guard back on? Or is there enough room to get a grip on the tube and wiggle it out of the socket?
    • Tubeglowpio
    • Thread
    • amplifier build diy stereo tube tube amp tube guard vacuum tube
    • Replies: 11
    • Forum: Tube Audio
  7. B

    Phonograph help

    I just purchased this console a few days ago and I have been looking it over. The phonograph on it needs some help. It turns on and turns which is a good sign. One problem with it though. The needle is gone and I havent a clue on how to replace and or place a new one in it...
  8. F

    Help Please, what is this?

    I have a Frazier "micro acoustic tuner" I can't find anything anywhere. someone please shine some light on this for me. what is it. what's it for, any place in the dark recesses of the web hold knowledge about this strange artifact?
    • fretknowmore
    • Thread
    • 400 acoustic amp frazier micro series tube tuner vacuum tube
    • Replies: 7
    • Forum: Tube Audio
  9. Gary Mattis

    Who made this Siemans 12AU7 tube ?

    Nevermind
  10. blistabusta

    Sansui 1000A Distortion From Reel To Reel Signal

    I would not say that I have tons of experience with the Sansui 1000A receiver but I have recapped and tuned three of them over the last couple of years. I really have a thing for this model. All three of the 1000A units that I have rebuilt share a particular problem that I cannot figure out...
    • blistabusta
    • Thread
    • 1000a distortion open reel receiver reel to reel sansui tape recorder vacuum tube
    • Replies: 12
    • Forum: Exclusively Sansui
  11. T

    1950's decade of Audio kit building

    Hi I'm new to this site and hope to add some facts about audio theory and building amps in the 1950-70s from kits and scratch. My first was a Lafayette 18w /per chan 7 tube Stereo Pwr Amp(hybrid construction)offered in kit form, I built it in 1958 The 2 Push-Pull audio output # 7189...
  12. davstev

    What 12ax7 tube brand is this?

    Hi all, I am no expert in tube identification, especially when the markings are partially rubbed off. See attached pics. These are clearly 12ax7's made in the USA, but can anyone else tell me, based on the white circular logo, what it might be? Any idea when it was made? There is no marking...
  13. C

    Need help with understandin average mutal conductance

    I recently bought out 3 radio store full of vacuum tubes. I have roughly 100000 vacuum tubes to test on a hicok tube tester that I just bought. I understand the roll chart up until it say average mutual conductance. Is that the min the tube should test to be good. Does that number for example...
    • chaztaylor
    • Thread
    • hicok tester mutual conductance average need help tube tester help vacuum tube
    • Replies: 35
    • Forum: Tube Audio
  14. C

    Need help with understandin average mutal conductance

    I recently bought out 3 radio store full of vacuum tubes. I have roughly 100000 vacuum tubes to test on a hicok tube tester that I just bought. I understand the roll chart up until it say average mutual conductance. Is that the min the tube should test to be good. Does that number for example...
    • chaztaylor
    • Thread
    • hicok tester mutual conductance average need help tube tester help vacuum tube
    • Replies: 1
    • Forum: Tube Audio
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