HK Torroidal transformers

[argonrepublic]

I was recently given a pair of transformers from a Harman Kardon AVR 7000.
I would like to know the VA on these and some suggestions for an amp design. Would they be good for an infinite baffle system? Whatt Wattage are these capable of supplying.

 

[scottjoplin]

Well, the VA is right in front of you there, V*A. You can reckon on that transferring into wattage available from suitable amplifier

 

[argonrepublic]

Thanks.
I am not certain which voltages to use. AC or DC? Load or no?

 

[scottjoplin]

Oh, I see, it says secondary DC, that's odd, use AC load voltage to give you an idea of available power. VA is an AC measurement of power

 

[JMFahey]

Incredibly detailed data, thumbs up for harman kardon.
The main secondary winding is 40+40VAC, 8.5A , so 680VA.
Add the other auxiliary windings and you have a >700VA transformer.

Search for an amplifier which requires raw +/-60V DC or thereabouts as power rails and both will be happy.

You´ll get 180/200 W RMS per channel into 8 ohms, 250/300W RMS into 4.

Infinite baffle? : the amplifier does not know or care about that, all it "sees" is load impedance at the far end of a speaker cable.
So YES, it will drive an infinite baffle prper impedance.

I would buy a full kit or even better an assembled board , plus suitable heatsinks and cabinet, it might need fan cooling, "you just add the transformer".

 

[AndrewT]

....... the VA is right in front of you there, V*A. ..........

...................The main secondary winding is 40+40VAC, 8.5A , so 680VA...................

you need to learn to read electronic data before you blow things up.

Or just follow Tony's advice and just experiment hoping to chance on a correct result and don't do any desktop research on anything beforehand.