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tube fanatic

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About tube fanatic

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    tube amp designer

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  • Interests
    extracting the best possible sound from single ended tube amps using modestly priced designs and tubes.
  • My System
    Now specializing in extreme near-field desk top systems using flea power SEPs and SETs. This mode of listening must be experienced as it can be totally enveloping.

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  1. The tubes will not be damaged if you turn the amp back on in less than 5 minutes. I’m guessing that they want the electrolytic caps to fully discharge before the next power up cycle. I would have to see a schematic and look at a few things to provide a better answer. I think they left out the word “not” in regard to #2 in the instructions. Maynard
  2. Jeffrey, I thought you stated that you and the others heard the same thing at Dennis’ house. Am I mistaken? Maynard
  3. https://www.npr.org/2020/02/14/806128410/harvard-professors-arrest-raises-questions-about-scientific-openness https://www.sciencemag.org/news/2020/06/fifty-four-scientists-have-lost-their-jobs-result-nih-probe-foreign-ties Maynard
  4. I'll have to do my own fact checking on this when time permits. If true, it exposes more reasons to be skeptical about the stated reasons for doing research into pathogens having the sole purpose of destroying life: https://articles.mercola.com/sites/articles/archive/2020/06/30/scientists-undisclosed-ties-to-foreign-institutions.aspx?cid_source=dnl&cid_medium=email&cid_content=art2HL&cid=20200630Z1&et_cid=DM580179&et_rid=905786312 Maynard
  5. Jeffrey, I would also like to know just what Fulton was trying to examine with a 2 gHz 'scope relative to audio. Heck, parasitic oscillation above the audio band can easily be picked up using square wave testing. Even a lowly 5 mHz 'scope is sufficient to make evaluations in my experience. The other thing I want to clarify is how anyone can discern a change in sound from 1/8" differences in wire length. If that's truly audible, then the density of solder used to make a connection with such a wire should be audible too. Remember, when soldering stranded wire, solder travels some distance into the strands under the insulation. How is that controlled and accounted for? Lastly, I have discussed in the past the non-linearity of the human auditory system itself. Given the huge person to person variability, I can't understand how a bunch of listeners can perceive exactly the same sound at the same time. I have never encountered this phenomenon when doing extensive listening evaluations with others. While we could hear significant changes, there was never any consensus in regard to tiny changes. https://www.researchgate.net/publication/228687973_Psychoacoustic_models_and_non-linear_human_hearing I look forward to clarification. Maynard
  6. The voice of doom speaks again: https://www.cnbc.com/2020/06/30/dr-anthony-fauci-says-new-virus-in-china-has-traits-of-2009-h1n1-and-1918-pandemic-flu.html As far as conspiracy theorists are concerned I, and many others, remain convinced that the virus was lab created and released with intent. However, we all wear masks when in any kind of public setting both for our own protection as well as others. No one, including those responsible for this situation, is assured of not getting sick. Maynard
  7. Here are some thoughts from the top: https://www.cnbc.com/2020/06/29/cdc-says-us-has-way-too-much-virus-to-control-pandemic-as-cases-surge-across-country.html And here’s more cause for optimism: https://www.sciencemag.org/news/2020/06/swine-flu-strain-human-pandemic-potential-increasingly-found-chinese-pigs Maynard
  8. NJ has finally issued guidelines for school reopening, and students are not required to wear masks while teachers and visitors are. There is no protocol for what will happen if a student tests positive. Will the rest of the class, and teacher, be forced to go into a 14 day quarantine every time this happens? Teachers posting on the teachers’ union FB page are livid and have raised more than 200 questions and concerns which the state has somehow forgotten to address in their 100+ page document. Many are now considering submitting their retirement papers out of concerns for their personal safety as well the safety of their family members. Ultimately, there is going to be a severe teacher shortage here as many college students are seriously considering changing to a different career track. Maynard
  9. My cousin’s husband is in the NYPD mounted unit and works in Manhattan. Talk about a dangerous level of exposure. One well aimed brick and he’s dead. The morale is extremely poor. Maynard
  10. Jeffrey, I do have another question as I try to follow your philosophy. Are you using fractional sizes of Fulton length wires in your builds? For example, when installing new leads on transformers, the leads from your input jacks, etc. If not, why do you find that unnecessary? Maynard
  11. The video in this article is worth watching: https://articles.mercola.com/sites/articles/archive/2020/06/27/elmhurst-hospital-coronavirus.aspx?cid_source=dnl&cid_medium=email&cid_content=art1HL&cid=20200627Z1&et_cid=DM573743&et_rid=903628347 Maynard
  12. The key issue is UV exposure so, if JL’s son is not bothered by brightness, going with Transitions is not necessary. Brightness does not make eyes get worse. In fact, recent studies on myopia progression in kids have shown that exposure to bright, outdoor light actually reduces myopia progression. Maynard
  13. More than ever I believe this virus was engineered— https://www.latimes.com/science/story/2020-06-26/inside-the-body-the-coronavirus-is-even-more-sinister-than-scientists-had-realized Maynard
  14. Yes, he is slightly myopic and his Rx is certainly minimal. If your son believes he needs to sharpen his acuity a bit, the Rx could be incorporated into a pair of protective glasses (which he should be using regardless) like Rec Specs. The lenses should be polycarbonate or Trivex for maximum safety. The latter has the advantage of better optical clarity, and doesn’t have the chromatic aberration issues of the former. Both offer uv protection. If the Rx doesn’t accomplish what your son desires, you can substitute plano (non Rx) lenses and just go for the safety. Maynard
  15. This is how a local care facility has decided to allow residents to have visitors. To me, it looks like an animal shelter! They certainly could have found a better way to ensure distancing. How demoralizing... Maynard
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