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Thread: Phil Jones Bass M-500 power amp

  1. #1
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    Phil Jones Bass M-500 power amp

    Does anyone have a schematic for the Power amp board for a PJB M-500? I'm finding this to be troublesome to work on due to part of the board being obscured by a heatsink and it's difficult to see where traces run.

    Tried three different contacts at PJ (including the man himself) but no reply.

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    Old Timer J M Fahey's Avatar
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    EDIT: I had answered thinking it might be using a Class D cookie sized power amp but just checked its page and itīs a 19kg box of electronics, so it must be a normal Class AB one.

    Or maybe a quad rail Class F/G/H one (never remember which is which )

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    Juan Manuel Fahey

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    Its a regular AB amp with just +/- 70v rails. It's impressive how compact it is - really neat. But this goes against it when troubleshooting.

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    Don't forget the joker g1's Avatar
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    Welcome back Mick, it's been awhile.

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    Just because they don't have tubes doesn't mean they don't have feelings! - glebert

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    Nice to be back.

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    Old Timer Leo_Gnardo's Avatar
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    Quote Originally Posted by g1 View Post
    Welcome back Mick, it's been awhile.
    I'll second that! Mick's back, woohoo! Bejeebers, it's been a long time. I'll take this as a good sign.

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    Last edited by Leo_Gnardo; 07-11-2019 at 08:30 PM.
    Enjoy. Every. Sandwich.

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