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Thread: G-500 Acoustic amp- anyone have info?

  1. #1

    G-500 Acoustic amp- anyone have info?

    Does anyone have any service info or a schematic on the G-500 acoustic amp? I have one for repair with a loud hum/buzz independent of the master volume. I did observe ripple on the PS rails- replaced the filter caps- no luck. I have a schematic for the G-600, but it doesn't seem to quite correspond to the G-500. For example, the G-300 and G-600 schematic show Zener diodes in the PS- but I don't see any for the G-500. Been chasing my tail for awhile on this one- any help would be greatly's almost like this amp came from some weird alternate universe and there is no information anywhere on it.

  2. #2
    Super Moderator Default's Avatar
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    Jul 2007
    Philly, or thereabouts
    They were built by Randall, iirc, so you might want to scout in that direction.
    "Steve, you are a man of many goats."~ capnjuan

    "Alternatively, you could just go the ultra-relic route with it. Basically go for a look that says the amp was on fire and they put it out using belt sanders."
    (amps - I need a "99" & "50")

  3. #3
    I have one, also not found any schematic. I think they were a short lived experiment before they came out with the fancier wood cabinet models.

    56 A-50, '57 CE-100, '60 X-150, '61 M-20, '62 F-20, '64 S-50 Jetstar, '64 Mark II, '65 SFIV, '71 S-90, '75 F-112, '75 Mark IVp, '81 M-80, '82 S-275, '86 T-250, 87 Nightbird I, 87 F-45ce, '88 Detonator, 92 F-15ce, '93 X-500, '97 Bluesbird, '99 F-30, '16 NS S-200 T-bird
    '54 Masteramp, '60 99j, '63 200-S, '66 Thunderbass, 66 Thunder T1-12, '69 Thunderstar, '92 G-500

    '94 G&L Legacy
    '03 Elder Lute
    '08 Parlor, '10 Butternut Deuce, '13 Rounder, '14 Kulakeiki

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