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biasing

  1. DatunWalnut

    help with biasing

    I'm working on a Mission Cyrus One Issue 06 at the moment. It came to me with a faulty phono stage that I've addresed so I'm now just making sure the rest of it is ok. It has a strange issue with it's biasing. The manual recommends that the bias voltage across the emitter resistor is 8 to 20mV...
  2. Carbsandcaps

    Bogen voltage problems.

    Bear with me this may be a long one. Working in a bogen srb-20 with some strange biasing and voltages. It uses 6BM8 outputs. Pin 9 (the plate of the triode) has 90v instead of 120v. Pin 1 (the grid of the triode) has 20v on it. The biasing has a weird setup. I’m supposed to have 20v on the...
  3. Carbsandcaps

    Biasing a bogen srb-40

    Working on a bogen stereo receiver and I’m trying to set the output bias. It has a weird current monitor setup where normally the cathode goes straight to ground but then you open these connectors and that puts a 15ohm resistor into the circuit. I’m assuming you then set the bias through the...
  4. D

    Luxman MB3045 biasing guide/help

    Hello all and thanks in advance I recently purchased a beautiful pair of Luxman MB3045 amps. They are running well but given the age and the previous history being unknown I would like to check the bias etc on them. I have done a bit of a search online and thought I would come across a service...
    • DanBun
    • Thread
    • amplifier bias biasing luxman tubes valves
    • Replies: 22
    • Forum: Tube Audio
  5. Carbsandcaps

    Fisher 700t bias problem solved!

    I thought that I would post this as a separate thread from my initial post in case someone else is having this problem, and thank you to the people that helped me out with it. I picked up a 700t relatively cheap “for parts and repair”. To my delight it actually turned on and produced sound by...
  6. Isaac C.

    Help Wanted Biasing a Lafayette LR-3500

    Hello everyone, I am new to the AudioKarma forum, however, I have been viewing the site for a few months now. I am also new to vintage audio equipment, having just gotten into the hobby last fall. Anyway, I acquired a Lafayette LR-3500 a few weeks ago on eBay for $70 in working condition. Since...
    • Isaac C.
    • Thread
    • biasing lafayette lafayette lr-3500 offset
    • Replies: 14
    • Forum: Solid State
  7. F

    Tubes for Unison Research's Simply Italy?

    Hello there. I own a Unison Research Simply Italy, which I adore. It uses two EL34 and two ECC82 (12au7) as rectifiers. So recently I decided to upgrade the 12au7's. After doing a lot of research, I went with the Psvanes. Right out of the box the sound was clearly more open and detailed than...
    • fedocable
    • Thread
    • 12au7 biasing ecc82 psvane simply italy tube amp tubes unison research valves
    • Replies: 2
    • Forum: Tube Audio
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