BeoWorld North America

Re: Beolab Pentas Mod 6621

colinhtucker — Mon, 07 Jul 2008 15:49:54 GMT

Thanks. Indeed I do not have the technical skill. I'm good for removing the screws, but that's it. Right now they're working nicely on the massive converters, but it's neither nice to look at nor very efficient. My nearest B&O is 300 miles away, so I'll try to find a local shop.

Re: Beolab Pentas Mod 6621

camshaft — Mon, 30 Jun 2008 19:52:22 GMT

colinhtucker:
Any thought on the level of challenge of rewiring 240v for 110?
I obtained an extraodinarily well-priced pair of 6632 at an estate sale (some cosmetic issues to the case, but the drivers are pristine, and the amps light up green when connected). I understand that to upconvert 110 to 240, each Penta needs 300w, which means an upconverter of 900w or more capacity. That's a shoebox-sized upconverter for each speaker, at $75 each. Makes the rewiring attractive even if a bit of effort is needed.

It's not difficult for someone who knows what they're doing, but if you're asking about it then you'd be best off having someone do it for you. It certainly is a better solution than using a converter transformer. You can remove the amplifiers at the bottom by turning the speakers on their side and unscrewing the screws at each corner. After unplugging the amplifiers from the rest of the speakers, you can take the amp to your b&o shop and have them rewire it for you. If there's a local electronics repair shop nearby, you could also take the amps to them and show them the schematics from the service manual.

By the way, changing the voltage won't change the wattage. Wattage = voltage x current. When you halve the voltage, the transformer draws twice the current, so the wattage remains the same.

Austin

Re: Beolab Pentas Mod 6621

colinhtucker — Wed, 25 Jun 2008 10:16:45 GMT

Any thought on the level of challenge of rewiring 240v for 110?

I obtained an extraodinarily well-priced pair of 6632 at an estate sale (some cosmetic issues to the case, but the drivers are pristine, and the amps light up green when connected). I understand that to upconvert 110 to 240, each Penta needs 300w, which means an upconverter of 900w or more capacity. That's a shoebox-sized upconverter for each speaker, at $75 each. Makes the rewiring attractive even if a bit of effort is needed.

Re: Beolab Pentas Mod 6621

beofan357 — Tue, 01 Jan 2008 15:33:32 GMT

They hqave been rewired to 110. Thanks forum.

Re: Beolab Pentas Mod 6621

Keith Saunders — Thu, 20 Dec 2007 12:43:41 GMT

Let me add my welcome to Beoworld.

I have reviewed the power supply circuit of the pentas and as you can see below it uses transformers with double windings meaning for 220 volts the windings are in series and for 110 volts they can be put in parallel, however there is no actual switch, this is something which would be done in the factory. You may wish to look at the 4 digit "Type" number because the US version is type 6603

Re: Beolab Pentas Mod 6621

Medogsfat — Mon, 17 Dec 2007 08:29:26 GMT

Not usual for multi voltage option to be included on USA market equipment for some reason, mainly Europe, but this isn't to say yours won't have this.

It could also be the case that someone has rewired the transformer to run at 110V as I believe this is possible but not 100% certain.

Welcome to Beoworld

Chris.

Re: Beolab Pentas Mod 6621

beo-ap — Mon, 17 Dec 2007 00:03:01 GMT

Older B&O gear had a dual voltage option. By selecting a switch, the equipment could be operated at either 110 or 220. Pentas were certainly of that vintage. Look for a selector swith in the power supply.

Beolab Pentas Mod 6621

beofan357 — Sun, 16 Dec 2007 20:56:56 GMT

Hello forum:

Received a set of penta 6621's which is listed as requiring 220 volt power suppy. However they have american (2) flat pronged plug. Can not find information if a step-up transformer is built in. Info would be most appreciated.

Confused?