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Three transistor LTspice sim

Posted 17th February 2016 at 12:10 PM by msdin

High Octane Preamp sim
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File Type: asc Phonostage 3 transistors.asc (5.9 KB, 864 views)
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  1. Old Comment
    abraxalito's Avatar
    I have run a very quick PSRR simulation and there's actually almost 20dB of gain @ 10Hz from PSU noise. I'm curious about this because of the remark by DIYbras that it sounds bass light. The LF PSRR can be fixed up by feeding R2 (100k) via an RC network. 100R and 470uF gives >20dB improvement @ 40Hz.
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    Posted 18th February 2016 at 05:19 AM by abraxalito abraxalito is offline
  2. Old Comment
    It is odd it does seem bass light.

    I've done a LP frequency response 20Hz to 20 kHz with my turntable and can confirm there is a roll-off.

    Iíve not had a look at the PSRR, Iíll give the RC mod a try later today.
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    Posted 18th February 2016 at 12:06 PM by msdin msdin is offline
  3. Old Comment
    abraxalito's Avatar
    Perceived bass lightness isn't about frequency response, though it sounds like it is - its generally about added LF noise. Ditto the subjective effect of HF roll-off, that's excess HF noise. I look forward to your result. If it improves the bass but doesn't totally cure it, try raising the 100R to 1k.
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    Posted 18th February 2016 at 12:53 PM by abraxalito abraxalito is offline
 

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