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#48427 - 03/03/02 12:06 AM anybody know the transformer size?
gchon Offline
Deputy Gunslinger

Registered: 06/29/01
Posts: 10
Loc: palos verdes, ca
would like to know how much current this amp would actually produce. Called outlaw, but didnt get an answer. All they could tell me that it contained 2 toroidal transformers.

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#48428 - 03/03/02 12:24 AM Re: anybody know the transformer size?
gonk Offline
Desperado

Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
Looking for how much current it will draw, or what the output is? The specs say that it has a max power consumption of 1800W (which on a 120V system, would indicate a max current draw of around 15A unless I'm even rustier on my electrical formulas than I think). Is that any help?

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#48429 - 03/04/02 10:50 AM Re: anybody know the transformer size?
Matthew Hill Offline
Desperado

Registered: 11/29/01
Posts: 1434
Loc: Mount Laurel, NJ
I don't understand how it can output 300x7 into 4 ohms and still only draw 1800W. My calculations, assuming 80% efficiency, put it closer to 2600 watts.
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#48430 - 03/04/02 04:52 PM Re: anybody know the transformer size?
Azistoohot Offline
Gunslinger

Registered: 02/06/02
Posts: 47
You're right -- It cannot be rated at 1800 watts and produce 7 channels at 300 watts. Something has to give. Of course, you're really going to have to be cranking a movie (or perhaps DVD-A or SACD) at high volumes to get 300 watts into 7 speakers.

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#48431 - 03/05/02 12:15 AM Re: anybody know the transformer size?
eurorom Offline
Gunslinger

Registered: 03/04/02
Posts: 96
Loc: El Paso Texas
ok.GUYS THE ANSWER IS VERY SIMPLE,48 AMP'S OF CURRENT PEAK.THANK YOU.....SMILE EUROROM TO THE RESCUE.

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#48432 - 03/05/02 09:56 AM Re: anybody know the transformer size?
eurorom Offline
Gunslinger

Registered: 03/04/02
Posts: 96
Loc: El Paso Texas
HI GUYS,I GUESS LAST NIGHT I WAS SLEEPY.BUT HERE WE GO.THE 770 AND 755 REPRESENT A DEPARTURE FROM MANY OF THE OTHER CURRENTLY AVAILABLE AMPLIFIER DESIGNS.THIS DEPARTURE IS THE RESULT OF CAREFUL STUDY OF ALL KNOWN AMPLIFIER TECHNOLOGY,CIRCUITS AND PARTS.I CAN SEE FROM THEIR ILUSTRATIONS,THAT THEIR MAJOR FEATURES OF THE 770 AND 755 ARE THEIR OUTSTANDING ABILITY TO DRIVE VIRTUALLY ANY SPEAKER,REGARLESS OF IMPENDANCE.BY USING APROXIMATELLY TWO 700 WATT TRANSFORMERS ALONG WITH 120,000 MICROFARADS OF FILTER CAPACITANCE.IT IS A WELL DESIGN AMPLIFIER TOPOLOGY USE BY SOME OF THE BEST AMPLIFIER DESIGNERS,EXAMPLE KRELL,McIntosh,CLASEE,LEXICON,AND MANY MORE.HOPE TO HAVE ANSWER YOUR QUESTION. EUROROM

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#48433 - 03/05/02 05:42 PM Re: anybody know the transformer size?
charlie Offline
Desperado

Registered: 01/14/02
Posts: 1176
Hey Euro -

Not trying to be a pain, but your caps lock is stuck......

The rating is 7 channels at 300w into 4ohms, continuous, so this isn't a peak figure. I'm guessing the 770 draws over 15 amps (19 maybe???) in this highly artificial scenario.

Assuming 100% efficiency it would still draw 17.5 @ 120 volts.

Although most household circuits are wired with 12 gauge wire and protected by 20 amp breakers (and so could supply this) I'd be surprized if UL approved the 770 for this use - the sort of plug most audio equipment has is a 15 amp rated plug.

| |
o 15 amp x 120 volt

| -
o 20 amp x 120 volt (IIRC)

Any way you cut it - in a real listening setup the total draw over time is going to be a lot less than this figure. Maybe UL looked at that factor - who knows?

Charlie
_________________________
Charlie

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#48434 - 03/06/02 12:22 AM Re: anybody know the transformer size?
eurorom Offline
Gunslinger

Registered: 03/04/02
Posts: 96
Loc: El Paso Texas
Ok.the question was How much current this amp would actually produce,not how much current it will draw from the wall.CHARLIE you are correct on the fact that it only draws 15,or at best 19 amps of current.

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#48435 - 03/09/02 12:58 PM Re: anybody know the transformer size?
Surrounded Offline
Gunslinger

Registered: 03/03/02
Posts: 44
Loc: Raymond,NH,USA
Quote"Although most household circuits are wired with 12 gauge wire and protected by 20 amp breakers (and so could supply this) I'd be surprized if UL approved the 770 for this use - the sort of plug most audio equipment has is a 15 amp rated plug."

I belive it would be impossible to produce 300 watts constant to all 7 channels with 15 amps. A standard house is wired with 14 gage wire with a 15 amp breaker and up to 6 outlets per breaker(depends on local codes). I will be running a dedicated line for my 770 I don't see any other way to keep from popping the breaker.

[This message has been edited by Surrounded (edited March 09, 2002).]

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#48436 - 03/10/02 08:03 PM Re: anybody know the transformer size?
eurorom Offline
Gunslinger

Registered: 03/04/02
Posts: 96
Loc: El Paso Texas
Possible it is to run 300watts continuos at 4ohms,the reason being that the amp stores energy.Plus it is almost imposible to run 300watts all 7 channels at any given time.If their is a movie or music that demands it,well then you have your storage ready to come into play.It is always nice to have your dedicated ac line. eurorom

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