JMI Vox - Grey Wah c. 1967

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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 28 Aug 2012, 13:38

Can you also confirm the wiring diagram while we at it? :)

http://www.turretboard.org/?p=30
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Re: JMI Vox - Grey Wah c. 1967

Postby deltafred » 28 Aug 2012, 14:58

It's an age thing, I know another guy with a 40 year old Wha pedal that he has had form new.

I will hang on to it for a bit longer and do you a full drawing of the board, that bit is easy.

I don't mind pulling the transistors out to measure them and I was going to measure the resistance and inductance of the inductor anyway.

Inductor 297mH - measured on a cheap DMM model no VC9808+ make unknown.
DC resistance 16.6 ohms (measured on 2 different DMMs).

I'll email you a zip of all the photos I take. It might not be immediately as I am away quite a bit in the near future.
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Re: JMI Vox - Grey Wah c. 1967

Postby deltafred » 28 Aug 2012, 16:00

sinner wrote:Can you also confirm the wiring diagram while we at it? :)

http://www.turretboard.org/?p=30

Yep, will do when I get chance.

Both Q1 and Q2 hfe around 410 measured on 2 different crappy little DMMs. This varies with temperature so no point being too precise.
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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 28 Aug 2012, 16:21

410hfe? twice as much as I was thinking... thanks :)

Also thanks for the rest, I had two another 300mH readings from my website visitors, but never the resistance...

You don't have to draw new template with board dimensions, I already did it, just look on it (it's on my website) and check against yours :)

Cheers
Pawel
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Re: JMI Vox - Grey Wah c. 1967

Postby deltafred » 29 Aug 2012, 22:09

sinner wrote:Can you also confirm the wiring diagram while we at it? :)

http://www.turretboard.org/?p=30

There is a missing link under the perf board. I have shown it above the resistors for clarity.

VOX Grey link.jpg
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Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012

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Re: JMI Vox - Grey Wah c. 1967

Postby deltafred » 29 Aug 2012, 22:24

Sinner

A very minor point.
The row of component holes are 0.5" apart not 0.45" as you have them. (I said it was a minor point).

The board is mounted by 2 self tapping screws (1/2" x 1/8" approx), on 2 paxolin tube spacers 1/4" long.
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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 05 Sep 2012, 09:18

Got the jumper fixed

http://www.turretboard.org/?p=30

I had it there in first version, but I've screwed making revision :oops:

Thanks a lot

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Re: JMI Vox - Grey Wah c. 1967

Postby Rjcastro76 » 18 Sep 2013, 07:48

Would 2 500mh inductors in parallel be similar to one 250 mh inductor? I understand the would have to be somewhat separated to shield the magnetic field....
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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 18 Sep 2013, 09:31

Rjcastro76 wrote:Would 2 500mh inductors in parallel be similar to one 250 mh inductor? I understand the would have to be somewhat separated to shield the magnetic field....


May be similar, but not exactly the same thing. Grey Wah Wah inductor use smaller diameter coil and different wire diameter. Inductor resistance will be off

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Re: JMI Vox - Grey Wah c. 1967

Postby Rjcastro76 » 19 Sep 2013, 03:44

Ok, I guess I'll try to get a 250mh one. Also, on turretboard.org, are both layouts for the grey wah correct? If not, which is? The top, or bottom one? Thanks
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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 19 Sep 2013, 11:29

Rjcastro76 wrote:Ok, I guess I'll try to get a 250mh one. Also, on turretboard.org, are both layouts for the grey wah correct? If not, which is? The top, or bottom one? Thanks



AFAIK they are correct. True to the schematic at least

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Re: JMI Vox - Grey Wah c. 1967

Postby Lucifer » 19 Sep 2013, 15:46

Hey Sinner - is that really you in the photo ?

Wow, you never told us you were so handsome !
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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 19 Sep 2013, 16:48

Dude, its Andy Pipkin ;-)
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Re: JMI Vox - Grey Wah c. 1967

Postby Lucifer » 19 Sep 2013, 20:38

I know, dude !

But if it was you, you'd still be a gorgeous bastard !
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Re: JMI Vox - Grey Wah c. 1967

Postby sinner » 19 Sep 2013, 20:42

Yeah, I know ;-)
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Re: JMI Vox - Grey Wah c. 1967

Postby PurpleOhmAudio » 12 Feb 2020, 01:24

deltafred wrote:
sinner wrote:Can you also confirm the wiring diagram while we at it? :)

http://www.turretboard.org/?p=30

There is a missing link under the perf board. I have shown it above the resistors for clarity.

VOX Grey link.jpg


Hi, sorry to drag this old thread up but does anyone know the actual board dimensions in these old Grey Wahs?

As deltafred mentions the component holes are 0.5" apart, and the tube spacers paxolin, so I presume the board will be, and looks to be just 1mm thick.

I have a few of the same enclosures from the corresponding volume pedals, one with the Vox logo on the casting, one is plain without logo but has the exact casting marks and imperfections etc,so in theory from the same place...

Got them on ebay, one was quite badly butchered (annoying the one with the Vox logo :x ), there was a DIN socket hole in the side (maybe for multi channel volume?] and put a spring and momentary switch inside, very strange....

Was going to build them into clones and get them going again, just need to get a few parts sourced, might even go crazy and goop the board too, might stop the mojo leaking out

On another note, does anyone know if there is a axle tension bar under the treadle on the original 'Grey Wahs', as these volume pedals do not, and seem to rely only on the pot friction, cant find any pictures that show it online, but it looks like originally there was a battery clip which may bolt through to the other side?

Cheers
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Re: JMI Vox - Grey Wah c. 1967

Postby nightraven » 12 Feb 2020, 22:17

PurpleOhmAudio wrote:On another note, does anyone know if there is a axle tension bar under the treadle on the original 'Grey Wahs', as these volume pedals do not, and seem to rely only on the pot friction, cant find any pictures that show it online, but it looks like originally there was a battery clip which may bolt through to the other side?

Cheers

Yeah, you're quite right, they wedged a battery clip upside down against the 'gear' of the pot assembly, to help keep it in place. Not only do the Selmer and JHS wah pedals from the 1960s seem to have enclosures cast from the same mould as well, they also have this upside-down battery clip thing going on as well.


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