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j baldam 22nd May 2012 07:56 PM

quad 33 comments please
my quad 33 pre has arrived.
After a bit of fiddling I managed to get it working on both chanels, radio2 only seems to work on 1. Radio 1 is fine.

Could any 33 owners please comment about the innards of this particular amp as I was going to mod it but it seems someone may have got there first.

Peeking inside I notice that all control pots are green plastic, all the pics I've seen show larger metal pots.

The volume pot does not have the facility to switch on and off, the amp is on all the time.

I've pictured the two main boards and they seem different to standard as does the power supply board. And the power supply wiring.:)

There is a liberal application of some silicone like substance over most components and boards

tinitus 22nd May 2012 08:47 PM

I dont know, but could it have been completely rebuilt ?

j baldam 22nd May 2012 09:10 PM

Hi, thanks.
If all the pots are non standard then someone has taken a lot of trouble.:)

Huntingdon 361 22nd May 2012 09:23 PM

It looks like:

1) All the pots have been replaced.
2) Most of the electrolytics have been replaced.
3) Some of the film capacitors on the M12017 pcbs are original, some replaced. The green box capacitors can certainly be original.
4) The mains input wiring looks non-original, and there is also some new wiring from the power supply board to the main pcb.

I am mystified as to why anyone would want to put that sealer/glue on the boards.

The Quad 33 is pretty straightforward to work on and you should have no trouble dealing with any problems. Report back if you're stuck on anything.

dennusch 22nd May 2012 09:24 PM

Every resistor, capacitor and pot seems to be non-standard to me.

Tekko 22nd May 2012 09:55 PM

Seems like some kinda conformal coating.

j baldam 23rd May 2012 12:43 AM

Hi, thanks,
It certainly looks rebuilt from the ground up.
Could anyone please identify this brown capacitor, it has a capital M in a circle, is it Motorola?

Tajzmaj 23rd May 2012 01:43 AM

I think it's Panasonic......

j baldam 23rd May 2012 08:42 AM

Hi I think your right, thanks,
I've found these but I can't find 22uf 250v, would anyone know of a supplier please.
4 PCS. Panasonic MPET Capacitor 0.22uF / 10% / 100V | eBay

Huntingdon 361 23rd May 2012 03:56 PM


Originally Posted by j baldam (
but I can't find 22uf 250v

Where do you need 22 250v?

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