Quad 33 Volume Control Action after Servicing

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26-Jan-2018 10:42 AM

beadlesabout

beadlesabout

Posts: 12

Hi all,

I just had my 33 serviced by Quad in Huntingdon. 

As part of the service they "cleaned and lubricated" the volume control.

It arrived back yesterday. 

I noticed straight away that the lovely, smooth, precise action of the 33 volume control has gone. It’s now a bit sticky and moves in steps and has about 3-4mm of play in it so it doesn’t always line up nicely with the marker in the off position. It doesn't have the same quality feel it had before servicing. 

A lot of people may not notice it but in contrast to how it was before I really do! 

I'm going to follow up with quad too, but I was wondering if any of you helpful folks might know how I could rectify it myself? I can't even work out how to remove the knob! 

Perhaps it just needs removing and reseating? 

Thanks v much in advance. 





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26-Jan-2018 11:28 AM

FBatista

FBatista

Posts: 119

Sound like the frontplate may be misaligned and the hex screw of the knob to the volume control shaft, not properly tightened.

If so, that's a very easy fix, provided the proper tools : A screw driver and a small Allen key.

What I don't understand though, is the "moves in steps". That sounds like an ALPS potentiometer, similar to the QUAD 34.

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26-Jan-2018 12:45 PM

beadlesabout

beadlesabout

Posts: 12

Thanks for the reply. 

I knew when I said in steps I wasn't being clear, sorry. It's hard to explain. 

What I mean is it's no longer smooth and moves consistently in increments, it sort of sticks and jumps slightly. 

Thanks for pointers on fixing. Could I be cheeky and ask for some more detail on that? I'm pretty handy and have lots of tools, I just want to make sure I don't force anything and take steps in the right order.

Many thanks!


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27-Jan-2018 12:40 PM

beadlesabout

beadlesabout

Posts: 12

I’m in luck!. I’ve just opened up the unit and the play is in the interface between the knob and the shaft (ooh pardon!). That’s a relief as should be an easy fix.

The problem I have is gaining access to the flat head (not hex) grub screw due to the fascia. 

Is it safe to remove the fascia carefully or will buttons fall off etc? 

Thanks


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28-Jan-2018 08:35 PM

beadlesabout

beadlesabout

Posts: 12

I was able to prize the fascia off enough to access the screw head. What's really strange is that taking the fascia off completely seems to require removing the tone and filter knobs, but those screw heads are also really tricky to access. 

Anyhow, it seems the point of the grub screw has made a tiny hole in the shaft. I was able to tighten it a bit but still not solid so I'm going to try and shim the squared off side of the shaft with a strip of electrical tape or similar to see if that will hold it in place better. 

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28-Jan-2018 11:01 PM

FBatista

FBatista

Posts: 119

Hi,

Sorry I couldn't reply earlier. For some reason I cannot reply messages here using the tablet...oh well!

You can in fact remove the filter knobs quite easily, by looking in between the back of the facia and the chassis, whilst rotating everyone of them until you see the hole with the flushed in screw from the top. Then, it only takes the required hex key to comfortably unscrew them.

Regarding the volume knob and shaft, try to adjust the tip of the screw with the existing hole. Chances are it's only misaligned. 

Or adjust the knob, considering the 0 point, but pushing it in or outwards, by a couple of milimetres, enough to use a different area of the shaft, making a tiny new hole.

The volume knob isn't flushed in with the facia, like the filter knobs are. A few mm in or out won't make a difference here.

When you screw back the facia to the chassis, mind the alingment on all 4 knobs plus the array of buttons. There should be a point where all these operate comfortably, without rubbing against the faceplate.

Good work!



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29-Jan-2018 07:41 PM

beadlesabout

beadlesabout

Posts: 12

Thanks FBatista, you've been most helpful! 

I've inspected the grub screws on the volume control and the slope and tone controls and the screw heads are wrecked. Before I proceed I'd like to source some spares because rounding them off and being unable to remove them would be very uncool. 

Do you know which sort I need and where I could source them from? Are they the same for all the knobs? 

One other question... 

After servicing, all the knobs are stiffer and sound like they're rubbing internally (where the carbon contacts are. According to quad they were cleaned and lubricated. Is this to be expected? I figured they'd be smoother if anything! 

Cheers.

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30-Jan-2018 07:16 AM

EJP

EJP

Posts: 1525

You don't need to remove the fascia to get at the volume control knob. Just remove the cover and rotate the knob to the point where you can get at the grubscrew from the side. There will be a slight angle on the screwdriver but it's doable.

If you do remove the fascia you have to remove the three small tone/filter knobs. Pushing in the nearest filter button in each case makes it easier to get at the grubscrew. When you replace then, make the front of each knob absolutely flush with the fascia so that the back of the knob doesn't rub against the marigold panel.

I've never found a source for these grubscrews, nor do I know what size they are.
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