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thd

  1. A

    CR-2020 bias adjustment issue after replacing some transistors

    I got a CR-2020 recently that had some issues on the right channel, and I slipped while probing it and created even more issues. After all the dust settled, I'm left with a right channel that I can't get the bias voltage below 20mV. There is also more THD on the right channel than the left. I...
    • asolochek
    • Thread
    • bias adjust cr2020 thd
    • Replies: 19
    • Forum: Yamaha
  2. Refugee

    Older McIntosh Equipment - Where does the higher THD rating come from?

    I was curious what y 'all's thoughts were as to which components contribute the most to higher THD ratings on older solid state 70's McIntosh equipment vs. modern. It could be capacitors, transistors, resistors, pots and switching, or board layouts. Caps need to be changed out anyway, but does...
    • Refugee
    • Thread
    • distortion recap and restoration refurbish solid state spechs thd vintage 70's
    • Replies: 15
    • Forum: McIntosh Audio
  3. MattiaM

    Distortion in a Luxman SQ38F

    I recently acquired a Rohde & Schwarz audio analyser and decided to start running all the amplifiers I have through it. One of these amplifiers is a Luxman SQ38F that I recently restored, and that sounds amazing. I will start by saying that valve amps are not something that I am very familiar...
    • MattiaM
    • Thread
    • luxman sq38 thd tube valve
    • Replies: 2
    • Forum: Tube Audio
  4. runningdog

    Marantz 2325 has high THD in both channels

    This 2325 had symptoms that included high Total Harmonic Distortion, made even worse with an 8 ohm load. While I was looking into this the receiver behaved inconsistently. This was after a rebuild. I set it aside in hopes that with a long rest it would fix itself. LOL. After digging in again...
  5. Gigantic

    Measurements for dummies…

    Before I do the deep dive and hack up my Super H clones and mount the K-604 horns in them, I feel compelled to take the next step in my audio journey and do some before and after measurements. I’ve downloaded REW and have been browsing calibrated mics; what do I need to know before I get...
  6. Walter R

    Eico HF-20 THD Evaluation

    My bedroom stereo has two monaural integrated Williamson amplifiers. One is an Eico HF-20 and the other was made by Elmat but appears to be an HF-20 clone. The Elmat has the same tube lineup and controls as the Eico but the power transformer appears different. I was curious about the THD of...
  7. runningdog

    2230 with high distortion

    I have a newly rebuilt 2230. It is a clean receiver and the rebuild went smoothly. Until distortion testing. The Total Harmonic Distortion measures high in both channels. The spec calls for <0.5% THD. This receiver exceeds that by the time it is putting out 2 volts per channel. At 15.5v (30w) it...
  8. J

    THD measurement on a budget - DIY HP 331A repair & restore

    If you are not taking measurement professionally , there is an option which I took to simply purchase a less than fully functional 331A for a song and repair it, this movie documents these events.
  9. jozeppy26

    SX-3900 vs SX-1980

    Everyone is familiar with the Pioneer SX-1980 beastly stereo receiver. I get what’s special about it to a very limited extend: the insane 270 wpc, the 3 speaker channels, the heft and size, and the beauty of all analog. However, why doesn’t it’s successor, the SX-3900 get nearly as much love (I...
    • jozeppy26
    • Thread
    • 1980 3900 amp damping factor pioneer stereo receiver sx-1980 sx-3900 thd wpc
    • Replies: 48
    • Forum: Pioneer Audio
  10. fdeelros

    HP 8903A Audio Analyzer Error 19 at start up

    Hello everyone, I recently turned on my HP 8903a audio analyzer and it went right way to error 19; and no matter what I do (press clear. power off and back on, etc.) it stays there on error 19. Any advise in how to clear the error? The manual I have is probably incomplete (only 147 pages) and...
    • fdeelros
    • Thread
    • audio analyzer audio generator distortion analyzer hp 8903a test equipment thd total harmonic distortion
    • Replies: 5
    • Forum: Test Equipment
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