Problems assembling a G2...

    I don't know if it happened to anyone... But after having drilled the Chassis with the correct holes and emplacements:

    The jack inputs' washers are too small and don't hold them into their holes. Not a huge problem, I'll just get new washers, but still, I expected everything to be 100% right with it.
    The decal just... washed away as soon as I tried to apply it. All the letters were on the outside and flew off the plastic
    Both labels on the On/off switch are labelled On. Slightly confusing ???

    Also, I don't quite get the instructions... It says we're supposed to isolate the + side of the power supply board... Does this mean I should just not let it touch the chassis (i.e ground)?
    EDIT: I figured that part out. DUH! It's written on the darn thing.
    Thirdly, the pictures in the instructions (sent to me via email on a PDF file) are quite blurry and I can't make up details. Where do those long washers need to go? I have 2 spare 4mm holes left between the fuse and one of the tube sockets. Do these special washers go in there to be ground points? I have 5 of these, I assume one is a spare.

    Ook that's about it so far... Thanks for any help guys.

    Re: Problems assembling a G2...

    hi pierre,

    the inputjack's washers should not be too small, you probably drilled the holes too big.
    before you drill any hole first check the size of the component going trough the hole and also check the drill size you are using.
    use a caliper gauge to measure both the component and the drill.
    drills often have their size written on the shaft too.
    drilling a large hole in sheetmetal is not always as easy as it seems, a drill with a certain size cannot make a hole smaller as the drill itself, but it can make a hole bigger than itself !
    anyhow if the hole you drilled is too big you will need to use larger washers,put one inside and one outside the chassis, get the right size at your local hardware store.

    I did not use the decal, I can not help you with that one.

    the power switch is a dpdt (double pole double throw) type, so that would be always on.
    since you are using it as an dpst (double pole single throw, you are not using two of its contacts) it becomes an on/off switch.
    simply do not use the label, martin did not use it either as you can see on the first picture of the manual.

    of course + of the powersupply should never touch chassisground, that will be a short.

    the long washers (solder lugs) should go to these holes, one closest to the fuse and the rest (all 4 of them) closest to the tube socket, the green earth wires are going to be connected there.
    these holes should be 3mm, if you did drill them 4mm first get bolts and lugs at the correct size because these earth connections are very important !
    it even could be dangerous when they disconnect !
    since all pictures in the manual are taken from the back side these solder lugs are quite hard to see, but at page 14 (of the german manual) you can clearly see one of them.

    I do not know about the 100uF caps, maybe someone else ?

    good luck, RR

    Re: Problems assembling a G2...

    Yeah I figured everything but the 100uf caps a while ago, thanks! And the holes were properly drilled, but but the washers looked too small compared to the pictures on the manual? The threads go in the hole properly until the main body, but the washer is the same diameter as the wee solid part after the thread, so it doesn't really work out.

    I put a piece of cardboard as advised under the board so there aren't no shortcuts so thast should work out fine. It was just the bridge rectifier part which I didn't quite get because I rushed a little into it hehe.. But I did use an isolant for it too and I finished the power circuit board and the basic transformer and power chord joints. Tomorrow, the signal circuit. OUCH.

    Ah and yeah I figured out the grounds too. All worked out fine thanks :) I'll finish it tomorrow and the day after and work on the enclosure.

    I just should stop rushing into questions all the time when everything explained itself after assembling the darn thing
    :-[ :-[ :-X


    I'm still unsure about the caps though... Are these the correct ones?

    Re: Problems assembling a G2...

    Zitat von Pierre

    I'm still unsure about the caps though... Are these the correct ones?

    If they are filter caps it probably makes no difference. In fact, 100uF is probably better and will mean you get less hum.

    Re: Problems assembling a G2...

    Well I assembled it with them anyway... I finished the power section today. All the readings are fine, except for the last one I get 285 instead of 265, which is beyond the 5% tolerance limit. I'll take it again tomorrow.

    Re: Problems assembling a G2...

    Zitat von Pierre


    Well I assembled it with them anyway... I finished the power section today. All the readings are fine, except for the last one I get 285 instead of 265, which is beyond the 5% tolerance limit. I'll take it again tomorrow.

    Is 285V with the tubes mounted? The voltage should a bit higher if the transformer is not driving a load.

    Re: Problems assembling a G2...

    Nah with tubes off... The manual didn't say to put them in so I didn't. If that's the thing, that's good news then, thanks!

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