Changing input voltage on Quad 33

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16-May-2018 11:31 PM

escuta

escuta

Posts: 5

One more question! I've just received a Quad 33 from interstate where the mains supply is 110V. Here it is 220. The 33 is set to 100-127V. I've taken the lid off and I can see no way of changing the input voltage. The online manual says: 

"Before connecting the mains supply, ensure that the
voltage marked on the rear of the control unit and the
setting of the selectors on the power amplifier and tuner
are correct for your mains. These selectors are set by
withdrawing the cap 3/8", rotating it to the required
voltage and pushing it fully home again"

I can't see what the "cap" is. Perhaps my unit is fixed at 100-127? Unfortunately it has no serial number. Looks like someone removed it.

I do have a transformer but I'd prefer to have the 33 set at 220V in case of accidents.

Thanks a lot.

Iain


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17-May-2018 08:31 AM

Stefaan

Stefaan

Posts: 575

Hello,

You can change the voltage by soldering the wire to the primary winding of the transformer to the 220V pin on the power supply board.

If this has not been done yet I would do a revision, replacing the worn out components, befpore switching it on as the amplifier has more than 40 years...

The revision-kit is here: http://www.dadaelectronics.eu/shop/quad-upgrade-kits/quad-33-upgrade-and-revision-kit

Also see the Upgrade / Revision manual, it is available on the Download-page.

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17-May-2018 11:24 AM

escuta

escuta

Posts: 5

Thanks a lot Stefaan. Yes, I see the solder point for 250V. I was very pleasantly surprised when I opened the unit up. It's as clean as a whistle and appears to have had a near complete revision done by a São Paulo company (there's their sticker on the transformer which looks new). All the caps have been changed on the power supply board with Hitano caps. Elsewhere too on the other boards excepted for some green rounded rectangular caps (lying on their sides) marked with "Hunts", which must be the originals.

All the best,

Iain

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