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single ended

  1. M

    Oldchen EL34 SE – Tubes light but totally silent. Pin 8 (rectifier socket) → first filter cap (+) reads “OL”. Safe to add a new lead?

    Hi all, my Oldchen EL34 single-ended amp heats up fine but there’s no sound at all (no hiss/hum). What I checked (power off, caps discharged): Heaters OK; all tubes glow. HV secondary looks OK (both rectifier anode leads show similar DC resistance; between them the sum). Key finding: Between...
    • MCR
    • Thread
    • single ended tube tube amp amplifier
    • Replies: 5
    • Forum: Tube Audio
  2. 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
  3. Trypower

    Potted Ouput Transformer- Is it PP or SE UL ??

    If I had an unknown overseas (to the west of CA) POTTED output transformer in my hands with 3 primary leads and a 0-4-8 secondary, how would I know for certain if it was push pull or single ended with a UL tap? This particular transformer is claimed to be UL single ended. I attached a file...
    • Trypower
    • Thread
    • 6l6 el34 push-pull single ended triode ultralinear
    • Replies: 55
    • Forum: Tube Audio
  4. VikingAmps

    6V6 SE plate voltage is higher than supply voltage.

    I've never come accross this before. I didn't think it was even physically possible, considering the there should always be a voltage drop across the OT. I'm restoring a pair of V-M model 165s for a friend. After replacing all the old carbon comp resistors with modern metal film resistors of...
  5. electricroo

    Audio Note P2SE clone

    Finished this as I have been working on it for almost a year when I had time. Sounds really nice. I'd like to see what the square waves look like on an original Audio Note P2SE. Video below P2SE Clone
  6. S

    What were the engineers trying to accomplish in this circuit?

    Greetings, I've recently serviced a Sylvania console chassis for educational purposes as I've not wrenched on a stereo single ended amplifier like this one before. (And I cannot say no to adopting an ugly amp that is getting no love.) With no markings, I had to draw out a schematic to make...
    • Sam Lysinger
    • Thread
    • console amp console pull se single ended sylvania
    • Replies: 17
    • Forum: Tube Audio
  7. Nac458

    ASUSA K2003 - Antique Sound USA Schematic request

    Hello all! I’m looking for a copy of the schematic for a small SET tube amp, model K2003, made by Antique Sound USA. These were built circa 2001 Thanks!
    • Nac458
    • Thread
    • 6bq5 el84 el84 triode set single ended tube amp
    • Replies: 8
    • Forum: Tube Audio
  8. zastin17

    Schematic For Magnavox 8302, EL84 Single Ended, "Refreshed Factory Drawing"

    I am making a habit of restoring really old poorly scanned schematics from factory units. And archiving them in Audiokarma for people doing "Google Searches" I take old nasty schematics, and clean them up in Gimp to be as clear, and precisely drawn as possible. Repairing "Pixel by pixel" This...
    • zastin17
    • Thread
    • 8000 8302 86xx console amps converted el84 magnavox single ended tube
    • Replies: 5
    • Forum: Tube Audio
  9. Squidward

    Kegger Schematics Mega Thread

    I'm going to start this thread with a specific aim: To preserve the knowledge that Kegger freely gave our community. This thread is for posting schematics that Kegger created. He designed some very popular amps (KT-88 SEUL, for one), but he also has some lesser known designs that shouldn't...
    • Squidward
    • Thread
    • amplifier diy el-84 kegger kt-88 push pull schematic seul single ended tube amp tubes
    • Replies: 51
    • Forum: Tube Audio
  10. Tubeglowpio

    Kegger/blueglow kt88 project

    Happy new year everyone! I've been really busy but have wanted to build the Kegger se kt88 for awhile now and after seeing blueglows youtube videos I'm sold. I enjoy my 5 watt se builds but have a party coming up this spring and need more power so am ready to get started but have a few...
    • Tubeglowpio
    • Thread
    • amp blueglow kegger kt88 se single ended stereo tube
    • Replies: 1,843
    • Forum: Tube Audio
  11. fink lever

    Valve Amplifier valve identification

    Hi all and merry christmas!!! I currently have an unusual custom vintage hi fi cabinet that i would love to get up and running. Looking at the unit it seems to be a 'Main Amplifier, an AM Radio Amplifier and FM Amplifier.' Lots of valves and transformers and not built for power but detail as it...
    • fink lever
    • Thread
    • 1940s homebrew push pull radio single ended tubes valve amplifier valves vintage wireless
    • Replies: 117
    • Forum: Tube Audio
  12. K

    New to AK ,bought an old tube amp ,need help

    Need help determining what this amp is,whether mono or stereo,i think its a packard bell.Two output transformers under chassis ,has 4 tubes,i see a 7 pin socket in photos.I havent received the amp yet its codes are rpt-1,dpa-5 ,serial num 10817 and says pb#70759 ,thanks for any replies,ill try...
    • klipschoid
    • Thread
    • magnavox packard bell single ended tube
    • Replies: 99
    • Forum: Tube Audio
  13. hobbit

    Boyuu A9 EL34 Chinese singled ended tube amp

    Just bought one of these after messing about with little bear, little dot stuff. It is probably the cheapest of the assembled EL34 single ended pentode (runs in ultralinear but easy to convert to triode mode) Im running mine with standard tubes and it sounds superb No hum, build looks really...
    • hobbit
    • Thread
    • el34 single ended tube valves
    • Replies: 0
    • Forum: Tube Audio
  14. scorron

    Magnavox 8303 SET Tube Amp

    I wanted to share a few photos of the 8303-20 Magnavox tube amp I just finished converting into a stand-alone and thank Audiokarma for some posts that helped me decide to cut out the tone controls ( which freed up a lot of space under the tiny chassis, and made it possible to fit the switch and...
    • scorron
    • Thread
    • 8303-20 magnavox single ended tube
    • Replies: 17
    • Forum: Tube Audio
  15. J

    1959 Gibsonette refresh

    Here is a video I made documenting a repair I did on the 59 Gibsonette using some extra care to keep the components looking as stock as possible. This one was plugged in when it should not have been so every thing needed to be tested after a complete burn out. The restoration movie The...
    • JRUBIN
    • Thread
    • 6v6 6v6gt gibson gibsonette recap single ended
    • Replies: 4
    • Forum: Tube Audio
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