I picked up a 100 watt matching transformer at a radio show for 2.00 today. The primary is 4 ohms and the secondary is rated "70 volts 100 watts". Has anyone ever used one of these so that a conventional amplifier could be used on a 70 V line? Could anyone think of any problems that could be associated with doing this? Thanks, Lenny
"klem kedidelhopper"
** You posted the same asinine question a month ago and it was answered.Shame it was not what you wanted to hear.
The term " conventional amplifier " simply has no meaning.
Your 70V line tranny would be OK with a valve amplifier.
... Phil
It will work OK, if it's a good transformer. It will convert a 4 ohm output to 50 ohms. 5000/100 = 50
We did this back in the '70s when 'smart' AKA 'cheapskate' customers bought the wrong equipment, then they wanted the system fixed.
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Oooh, i have a units issue here: V=3DIZ P=3DVI =46ull signal voltage system relates as: V^2/P =3D IZIZ/IZI =3D Z
Make that watt*ohms
date.
The only issue is just how high power, at 10 kW not bad, at 1 MW power distribution becomes incorporated. At 1 MW the power distribution system for the PA system (many amplifiers) itself is in arc flash hazard territory, very not funny.
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The amplifiers are rated at full power, continuous service, with a sine wave that the Constant voltage out.
A properly designed high power sound system uses multiple amplifiers, and usually distributed to minimize power loss by placing each amp near a cluster of speakers. Then one amp feeds all the remote amps at the same distribution voltage. It is then matched to the line in of the power amps. Transformer isolation reduces chances of lightning damage.
The worst I ever saw was at an amusement park where some clown put all the amps at on end of the park, and ran overhead and buried 70.7 volt lines all over the park. Some runs were over two miles. On top of that, all of the amplifier inputs and outputs were paralleled, and they used those old cheap 300 ohm TV antenna knife switches to connect or disconnect each amplifier for troubleshooting. It was no wonder they lost amplifiers on a regular basis. The system would get very distorted, so they would start flipping switches till it cleared up, then add the standby amp, if it wasn't away being repaired.
This is the type switch I'm talking about.
The local Lockheed-Martin facility has over 10 KW distributed audio that I understand is a complete hairball. One amp feeding the next in a daisy chain, and from building to building. Speaker wires run all over the place, and not always to the closest amp. Then the work space has been modified repeatedly for decades. I ran into the head of maintenance one day and overheard him talking with one of his techs about the mess and tried to explain how it work, then realized I was talking to a couple electricians.
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