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John Warren

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John Warren last won the day on October 4 2014

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  • Interests
    Engineering-Audio, magnetics, materials for electronic and magnetic applications, engineering models and simulation, SPICE, MATLAB, FORTRAN, acoustics, complex algebra, physics of sound, microphones, vintage audio, loudspeaker design, amplifier design, McIntosh amplifiers, discrete semiconductor devices.....and movies including silents, foreign and indies.
  • My System
    Speakers:
    12" Utah Tri-axial drivers mounted in LRE bass "reflex" enclosures.

    Tuner:
    Sony Superscope FM only

    Amplifier:
    Lafayette Solid State Stereophonic Integrated Amp

    Cables:
    16 GA Lamp Wire

    Headphones:
    Koss Pro 4AA

    Turntable:
    Technics SL-QD33

    CD Player:
    NAD 325i (modified)

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  1. Water should be either deionized or distilled. A friend of mine uses distilled water and Simple Green surfactant solution. It's alcohol based. Chemical smell. The u/s cleaners that sweep the frequency clean better than those that sit at a single frequency. With the surfactant and swept frequency embedded particles can usually be extracted.
  2. It may be possible to remove the transducers from the plastic horn section and find ones that would fit. Can you provide photos of the rear of the assembly and, if possible, remove the transducers so we can have a peek?
  3. John Warren

    Diet

    The WSJ had an article that talks to the concept of "health-span" rather than life-span. Health-span is the years one lives with good health and free of diseases that impact your quality of life and state of mind. The years past when the health-span ends are the years spent managing disease. Most medical interventions, especially for the 75+ crowd, increase life-span but not health-span.
  4. Common in industrial locations. If you have a portable water pump, wet-vac or using power tools in wet areas this is what you want. If you work on vintage, old and/or faulty electronics, lots of "gotchas" and surprises. Here's my take, connect chassis directly to panel Earth. Regarding Variac, the red, Chinese Amazon units are the POS. Can't run at rated kVA without getting hot AF. Wipers aren't accurate or don't function until the wick is turned halfway up then wham! The internal winding is likely a better fuse than the fuse. A Staco 12A variable transformer runs about $650 and will source 1.4kVA all day and barely get warm.
  5. Texas Instruments published a 2-stage, phono preamplifier design based on the LM833. Flat RIAA response with noise floor lower than -100dBV. Can be fabricated for about 60 USD at the board level.
  6. Are you running long cables at line level signals?
  7. The unity coupled transformer offers improved performance for CL-B vacuum tube operation only. CL-B amplifiers are somewhat higher efficiency than CL-AB.
  8. High BP can have nothing to do with weight. I recall a statistic that ~20% of the people on BP meds are at a good weight (i.e. BMI <24).
  9. It's dB (capital B for Bell as in Alexander Graham).
  10. John Warren

    Diet

    A1C is the gold standard, most docs will prescribe an A1C if a couple of 12h fasting BG ratings are 105-115 (at least that was my experience). The correlation coefficient between BMI and A1C for the 50+y/o crowd is basically =1.0 so if you're heavy or obese you're most likely prediabetic or diabetic. To your point, you can live into your early 90s with all sorts of metabolic issues. I've got family members there now. And they're depressed, immobile (really crippled), fatigued, constantly panting and vision impaired. And that started 10-15 years ago. Not saying I won't experience same fate but if there's any opportunity to avoid it, I'll try. Genetics loads the pistol but it's lifestyle that pulls the trigger.
  11. John Warren

    Diet

    In the meantime, researchers are still trying to figure out the causes of obesity in the USA.
  12. John Warren

    Diet

    the health experts...
  13. John Warren

    Diet

    And more along those lines...
  14. John Warren

    Diet

    Shown below, the reason nearly 40% the US population is obese and we're in a T2D crisis in this country. They want you sick.
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