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S-Man's Recent Activity

  1. S-Man liked Arkless Electronics's post in the thread Toshiba GT20D101/102 replacements?.

    IXYS.... Already discovered those myself and used them in a high voltage regulator:)

    Jun 28, 2022 at 9:51 PM
  2. S-Man replied to the thread Courtiestown - Naim Amplifier (Avondale) Upgrade Project.

    I have had poor subjective results using Walt's circuits, even though they appear rather cunning. This makes me cautious of his...

    Jun 28, 2022 at 8:49 PM
  3. S-Man replied to the thread Modifying NCC200 boards.

    I think it will only make a difference at high current. I have other reasons for doing this in the NCC300.

    Jun 28, 2022 at 8:39 PM
  4. S-Man replied to the thread Toshiba GT20D101/102 replacements?.

    Can't remember TBH. I think they are used in the "Alpha big boy amp", or something like that. I also don't visit that site much, the...

    Jun 28, 2022 at 8:37 PM
  5. S-Man replied to the thread Modifying NCC200 boards.

    I run my NCC300s with the driver emitters not connected to the output, which is supposed to improve the charge suckout behaviour of the...

    Jun 28, 2022 at 8:30 PM
  6. S-Man replied to the thread Toshiba GT20D101/102 replacements?.

    They were supposed to have the ease of drive of mosfets and the current gain of bipolars. Tosh had to do some engineering to avoid the...

    Jun 28, 2022 at 8:21 PM
  7. S-Man liked a.palfreyman's post in the thread Modifying NCC200 boards.

    Used a BD437 for thermal compensation: [IMG] Tweaked the bias current with my 3.13kHz oscillator with the amp at 4Vrms output into 7R5,...

    Jun 25, 2022 at 5:36 PM
  8. S-Man replied to the thread Budget secondhand standmount speakers.

    It's possible that my Concept 20s were not up to spec, but they sounded very poor. Very dull and boring. Listen before purchase if...

    Jun 25, 2022 at 10:04 AM
  9. S-Man replied to the thread Modifying NCC200 boards.

    You need a closed case to achieve (a rather slow) thermal feedback loop to TR5.

    Jun 25, 2022 at 10:00 AM
  10. S-Man replied to the thread HackerNAP troubleshooting help please.

    Ah, only just looked at this. Your amp is broken!!! At the very least TR7 and TR8 are kaputt.

    Jun 25, 2022 at 9:49 AM
  11. S-Man replied to the thread HackerNAP troubleshooting help please.

    The R26 thing doesn't make any sense - maybe you have some residual charge stored somewhere, otherwise DVMs don't give negative values...

    Jun 25, 2022 at 9:43 AM
  12. S-Man replied to the thread Avondale Power Amplifiers.

    Not quite. Naim has SOA protection and reasonable supply voltages. Many Avondale builds push the rails up which could cause thermal...

    Jun 23, 2022 at 9:57 PM
  13. S-Man liked ToTo Man's post in the thread Falcon Acoustics re-introduce the Q7 MiniMonitor..

    In my room the Q7 had a slight saddle in the lower mids and elevated high frequencies compared to the JR149. The JR149 has stronger...

    Jun 22, 2022
  14. S-Man replied to the thread Falcon Acoustics re-introduce the Q7 MiniMonitor..

    Interesting that the reason that the Q7 is preferred to the LS3/5A by some is cited to the bass response changing the overall balance....

    Jun 22, 2022
  15. S-Man replied to the thread HackerNAP troubleshooting help please.

    29mV across 27K is 1uA which is about right for the base current of the input transistor. I.e. 1uA X ~500 (TR1 hFE) = 0.5mA which is...

    Jun 22, 2022




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