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  1. PRR

    Novar base list?

    I choked the forum table-layout. Does this work for you? Tubes / semiconductors by category - Base Selected: Novar, B9E = bigger than Noval, USA 1959 Result: 1 to 98 from 98 Name Maker Year User Usage Type Base Pin-Assigment Charts Photos...
  2. PRR

    Alembic F-2B transformer for balanced audio output

    For the mono mode. Are you doing that? Each side alone is 40k. Triodes are not real fussy about loading. If you need a teeny number on the THD meter, you want as high an impedance as you can manage. Since this question maybe goes in the Musical Instrument section, 2%-5% THD may be "nice" but...
  3. PRR

    Choke vs inductor

    Then what is a "condenser" and how old are you? Inductor is a theoretical concept. "Choke" comes from telephone systems. It passes DC (to power the microphone) but blocks ("chokes") the audio out of the battery circuit. Practical function, not theory. "Condenser" persisted in car spark...
  4. PRR

    Notre Dame cathedral

    It It wants me to log-on because I "used up" my free articles. The site is safe and reputable, but we all have reasons not to play games. If I use FireFox's "Reader View" (F9), I do get the text of the article and some pix, without nags, anonymously. It is somewhat interesting (a burned-out...
  5. PRR

    Something to lighten the mood

    Norway's Biggest Newspaper:
  6. PRR

    Something to lighten the mood

  7. PRR

    And what did we buy today?

  8. PRR

    VTVM frequency-dependent drift

    The input divider can't be 10M(eg) to 30 (micro? kilo?). A rough thumb-count says the lower part is 33.33k. Separate the problem of the lows from the highs. Use as low a test tone as you can read well. Even 50Hz. (The 2000pFd/33K crossover is 2,500Hz and you want to be 10 or 100 X away from...
  9. PRR

    Something to lighten the mood

  10. PRR

    Old Kenwood phonostage, any improvements?

    What do you hear that is wrong? I see a thorough design with three generous supply voltages, three JFET stages, some very specific resistor values (415k is 1% series and now hard to replace, and not likely to need replacing), by a company which blew hot and cold over the years but this is sure...
  11. PRR

    Power Amplifier PCB Sanity Check

    Checking pastel details makes sore eyes. C2 is backward and way too big (0.017Hz). Use another of C11, 10nF, and you don't need polarity. What is the DC voltage on the filter network between U3A and U3B? Zero or plus six? I think R10 can return to +6 BUT you want a big bypass cap on that...
  12. PRR

    PYE Stereo Black Box G63

    They are a "Loudness" network. And very unlikely to be no-sound. So compare to the working channel. Also: all the grids are at DC ground. A finger (preferably a metal stick for precision poking) on each grid should produce "bZZZZT!" in proportion to how far along it is. One grid bzzzz1 and...
  13. PRR

    Class D in 1966

    Class D in 1966. A filler article by Don Lancaster.
    • PRR
    • Thread
    • Replies: 9
    • Forum: Class D
  14. PRR

    BC550 BC560 are low noise?

    The source and the base resistance are in series. For low-Z source (MC phono) the base resistance dominates.
  15. PRR

    slowwww

    Noted.
  16. PRR

    slowwww

    That would be a terrific tool, if it were my job. Thanks. I may use it to provoke some other webmasters who deserve it.
  17. PRR

    slowwww

    I was being nice.... I know it isn't just me (and my sucky cable service). I waited 5 hours to comment, I shoveled snow, I surfed big and small for-profit and for-love sites.... DIYA was consistently slow. I don't care to run analysis tools; not my site, I retired from all that. Mentioned...
  18. PRR

    slowwww

    Fixed. Thanks. (Server-side? Or just because it snowed here?)
  19. PRR

    Testing White Noise Generator Devices

    Pink noise is filtered white noise. So is 'brown' noise. So white noise is your raw lumber before painting. There was a "digital random" chip 30 years back. I used it a lot. But the repeat was very audible, every few seconds a thump. The consistent dynamics and non-tone sound made it good for...
    • PRR
    • Post #9
    • Forum: Parts
  20. PRR

    slowwww

    All day since ~~noon EST, page loads that usually take 1-2 seconds are stalled for 5, 10, 30 seconds. Right now I am watching a tiny upload I started 10 minutes ago (I may have botched it).
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