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    First post, PAS 3 grounding question...

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    hogzilla

    Posts : 14
    Join date : 2015-09-04

    First post, PAS 3 grounding question...

    Post by hogzilla on Mon Sep 14, 2015 11:29 am

    This is a complete noob question, but here goes… I am rebuilding a PAS 3 starting with the Tube Nirvana I/O board and 6 position switch and will be doing the Z-Mod boards. I have all my wires twisted and ready to go but one hold up. Where does the ground go? I’ve seen reference of running it to either the 12X4 ground or the quad cap ground, but I see the ground wires wound with the signal wires from the I/O board, but they don’t look to be ground to anything near the switch. Could someone shed light on what is going on with this setup? Are the twisted wires simply for shielding with an actual ground wire running from the I/O board to the chassis ground? Does anyone have a good detailed photo of what is going on here?

    Thanks in advance! There is a lot of great info on here!

    MontanaWay

    Posts : 767
    Join date : 2014-02-06
    Age : 58
    Location : Cameron, Montana

    Re: First post, PAS 3 grounding question...

    Post by MontanaWay on Mon Sep 14, 2015 1:34 pm

    this has been taken care of, I have communicated directly with hogzilla.

    GreggW

    Posts : 55
    Join date : 2015-07-15

    Re: First post, PAS 3 grounding question...

    Post by GreggW on Mon Sep 14, 2015 1:37 pm

    Nice, I offered to send him pix..

    hogzilla

    Posts : 14
    Join date : 2015-09-04

    Re: First post, PAS 3 grounding question...

    Post by hogzilla on Tue Sep 15, 2015 10:53 pm

    Thanks a lot gentlemen! I appreciate the help MontanaWay. This has me in order now. I'll keep y'all posted as I go. I'm taking photos as I make my way through this.

    lagunamike

    Posts : 7
    Join date : 2015-09-18

    Copy of the reply please

    Post by lagunamike on Fri Sep 18, 2015 3:52 pm

    Would like to see MontanaWay's reply to hogzilla.  Am finishing up my ZMods on an unbuilt PAS3 kit and wiring from scratch. I was planning on floating the power and signal grounds from chassis, but this info might help me make that choice.

    hogzilla

    Posts : 14
    Join date : 2015-09-04

    Re: First post, PAS 3 grounding question...

    Post by hogzilla on Wed Sep 23, 2015 2:08 pm

    lagunamike wrote:Would like to see MontanaWay's reply to hogzilla.  Am finishing up my ZMods on an unbuilt PAS3 kit and wiring from scratch. I was planning on floating the power and signal grounds from chassis, but this info might help me make that choice.

    Here's the email response he sent. It helped clarify what I was confused about...

    "With all the wiring from the RCA I-O pcb to the selector switch, you only ground ONE end, the RCA I-O pcb end. At the other end, the selector switch end, you push the ground wire back a little and/or curl it around the signal wire, then only solder the signal wire to the rotary switch. This way, the wire is still shielded being connected at the I-O pcb end, hope this makes sense."

    lagunamike

    Posts : 7
    Join date : 2015-09-18

    Grounding scheme solved

    Post by lagunamike on Wed Sep 23, 2015 3:39 pm

    Thanks hogzilla. MontanaWay got me squared away. I was familiar with the wiring of the selector switch, but confused with the instuctions in the ZMod that said to 'float' the ground. You still make chassis the ground for the B+ AND AC Gnd. Star configuration is strictly followed.

    GreggW

    Posts : 55
    Join date : 2015-07-15

    Re: First post, PAS 3 grounding question...

    Post by GreggW on Wed Sep 23, 2015 10:35 pm

    I, too, got some great advice and help from MontanaWay for my PAS3 basket case project. It works so well that I don't think another preamp is needed. Well, not yet....

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