Hi Gentlemen, maybe I just posted the original question at the wrong place, "PA" stuff..
Would you please just either bring that whole to here (into PSU section) or have a look at the question ?
Thank you.
Would you please just either bring that whole to here (into PSU section) or have a look at the question ?
Thank you.
Hi,
by it's dimensions, that transformer's rating indeed appears to be 2.4 kVA. The amp manufacturer most probably relys on the crest factor of music and on the fact that no one draws 8 kW of output power continuously. Anyway, never try to drive all eight channel with a sinusoidal signal at full power, 'cause the tranny will burn then.
Best regards!
by it's dimensions, that transformer's rating indeed appears to be 2.4 kVA. The amp manufacturer most probably relys on the crest factor of music and on the fact that no one draws 8 kW of output power continuously. Anyway, never try to drive all eight channel with a sinusoidal signal at full power, 'cause the tranny will burn then.
Best regards!
^^^^^^^ That.
The transformer is not small at all, it´s incredibly tall so you DO have iron there.
A better indicator might be its weight.
And Monacor is an established commercial PA equipment manufacturer/seller, in principle I would trust them, it´s not a "mystery EBay/Alibaba" amplifier.
8 separate amplifiers in the same cabinet is not very common, I do not imagine it at all in a Stadium amplifying Metallica but in a commercial setting, say a Restaurant, where different and adjustable power is needed in different areas, and basically providing background Music.
Also imagine multilevel Hotels or Department Stores.
So I would never expect any channel driven hard, even less all pushed simultaneously.
Outputs short range 8/4 ohm but Monacor also sells step-up transformers for 70/100V lines and speakers (sometimes embedded on ceiling) with matching transformers.
Specs look reasonable too, power quoted is 1280W RMS total, 2400W "power consumption" rating is very generous and in my view aims more at "dedicating an outlet just to this amp and not plugging a coffee machine or a microwave oven in the same strip".
The transformer is not small at all, it´s incredibly tall so you DO have iron there.
A better indicator might be its weight.
And Monacor is an established commercial PA equipment manufacturer/seller, in principle I would trust them, it´s not a "mystery EBay/Alibaba" amplifier.
8 separate amplifiers in the same cabinet is not very common, I do not imagine it at all in a Stadium amplifying Metallica but in a commercial setting, say a Restaurant, where different and adjustable power is needed in different areas, and basically providing background Music.
Also imagine multilevel Hotels or Department Stores.
So I would never expect any channel driven hard, even less all pushed simultaneously.
Outputs short range 8/4 ohm but Monacor also sells step-up transformers for 70/100V lines and speakers (sometimes embedded on ceiling) with matching transformers.
Specs look reasonable too, power quoted is 1280W RMS total, 2400W "power consumption" rating is very generous and in my view aims more at "dedicating an outlet just to this amp and not plugging a coffee machine or a microwave oven in the same strip".
Admittedly I was in some severe error, as 8 times 100 Wrms by no way means 8 kW of output power. I think I'd have to go back to school again 😵 ...
Hence, the toroid appears to be sufficient
!
Best regards!
Hence, the toroid appears to be sufficient
!Best regards!
Thanks.. but.. still.. I still sense some 'lies' here, even with 8x 100W RMS.
A transformer of 13cm diameter, 11cm height considered tall ? (Okay, just asking). My toroidals are all at around 7-8cm, nothing special.
Anyway, what could be the overall rating (in VoltAmpers) for such a trafo ? Trying to figure out what kind of load it could drive within safe limits. With sine wave, no "musical signals anyway" cheating. So what could be the REAL rating of it (in VA) let's say for feeding a Class A amplifier ?
Due to constant load of ~90% even if idle, it's closer to a heater than to a musical device (no pun intended) and this power draw behaves like a square wave, not even a sine wave.. so.. the load would be really heavy. Or I could have also asked how many 6C33C tubes can I heat with this thing (properly connected) after (properly sized) classic diode bridge rectification ?
So I really need some kind of good-safe not overheating estimation on this trafo. Maybe you can help, .. any ideas ? (Still in VA form). What would you put onto its datasheet ?
(Using Class D amp modules, musical signal really can be source of saving consumption, hence load on the PSU & trafo. With Class AB, still some gap between stated and real safe power output, but with Class A not anymore, it always and constantly draws current so a good example for closing out all that 'musical signal' related speculations). 😉
As I said, I think the 2400 VA note isn't exaggerated for a toroid of that size. Is his really a class A amplifier, as you wrote above? Anyway, even in the assumption it really is, DC power draw will be a bit more than 8 x 100 w x 2 = 1600 W. Your tranny easily can cope with that.
And, as the main secondary reads 40-0-40 Vac, how would you heat 6C33C's from it?
Best regards!
And, as the main secondary reads 40-0-40 Vac, how would you heat 6C33C's from it?
Best regards!
I don't really get why you are so hung up on this "transformer power", because how much idle current do you really need for a class A amp anyway? Do you know how much power you really need for class A?
Because I'd like to know if it's worth buying it or not and on the site it's advertised nobody knows and everybody is just guessing at around 300-600VA, not more, due to the fact most of us already has toroidal transformers of this size and at around 250-400VA, one has even a 1.5kVA model - twice this size, so nobody dares to rate this trafo to that much (and nobody dares to believe this amp can push out this much of power).
Kay Pirinha: series connection ? What's wrong with 12x3 = 36V ? (Okay, maybe the current draw). At 40V, 3 tubes in series are heated easily. But it was just an example, I would (of course) use this for a mosfet build.
Lots of baloney here trying to "prove" a preconceived idea, NONE even remotely related to Monacor amplifier use.
Which again, STRONGLY suggests light multi-area paging and background music duty.
If you are so certain it won´t work for you, why even ask?
Keep searching.
To make it more clear: do-not-buy-it , period.
Well, that's not the kind of answer I expected, nor is it professional but nobody is perfect, I try to understand that.
Anyway, maybe I just simply ask this in another forum where I might get closer assumptions to a real-world safe use (instead of Monacor since it has nothing to do with Monacor anymore, the seller has taken it out of the original failed device and now all potential buyers are guessing what it can be good for in DIY).
Never mind.
Anyway, maybe I just simply ask this in another forum where I might get closer assumptions to a real-world safe use (instead of Monacor since it has nothing to do with Monacor anymore, the seller has taken it out of the original failed device and now all potential buyers are guessing what it can be good for in DIY).
Never mind.