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Crown Techron 7550 PS2 power supply amplifier?

Tokin

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Don't ask me why but i have a habit of picking up stuff from the roadside.
Yesterday while driving thru a ritzy lake front community i see a piece of electronic equipment put out by the road and took it home.
Its a Crown/Techron 7550 power supply amplifier. It appears to work, it powers up and cycles to standby as it should. Does anyone have any knowledge of these units?
I included a pdf of the unit manual.
20200618_112759.jpg
 

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  • 7550.pdf
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Handy Andy

Do Your Research First, Then Decide...
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It a very big audio amp - rated 4 ohms, so the "ritzy" house neighbor got it for their kid and "Garage band"

One of it's claims is to "Shake a building" which depending on the poor hapless neighbor that has to listen to the noise the kid is able to make - being put thru there - will potentially even cause landslides in and around certain beachfront housing units...

  • It's used (er, can be operated :)) to power a sonic transducer unit that allows you to determine a natural resonance of a residence or a building to prevent premature failure.
  • Makes a Great Stereo component - drives those Kraco 6X9's right across the floor - the ones they got from K-Mart before they went under.


Thanks for sharing this...
upload_2020-6-18_18-41-19.png
 
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Tokin

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Thank you Andy. I need to test it then decide of i keep it or sell it. I didn't find much info or any useful vids.
 

sunbulls

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I’d repaint those crash handles and do whatever details that would make it presentable for sale. Around $200 is a fair estimate for one in good condition, possibly a lot more once it’s been reconditioned or certified from a pro audio shop. Of course to get it up and running, you will need a pre-amp with a pair of BNC adapter cables plus a pair of speakers that can handle the power. A high wattage amp like that will give you the natural bass that’s often referred to as “crunch.” It’s that feeling you get in your gut, even at low volume levels. It’s perfectly suitable for easy listening. Also, it’s a great item for trading. Want a nice stereo for your car or truck? Take it to your local car stereo dealer. They’re able to fully test any amp and possibly offer a fair trade, but I wouldn’t let them low ball you on that quality piece.
 

Handy Andy

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I thought about that amplifier last night...

It has me wondering if we had a means to drive into a load - like a loudspeaker...but into an amp.

Why not make one a modulation transformer in such a fashion that you could pips the audio into the amp - kinda like a push pull - using one channel for each side?

I imagine this would need something like 8 AWG wire (enamled) along a form and tapped...

Then the crazy stuff piped into the dream...

Leyden jars - the old archaic versions of the Electrolytic caps we take for granted today...

Leyden%20Jar%20Diagram_5C20.30.jpg
Since the power handling of a typical simple electrolytic may be exceeded - thought that the older versions might be safer

There is an anecdotal story that I read as a child ...
827430.jpg

And with Kopcicle posting images of toasted rodents...

There's a bit of a humorous chapter in the book about how Ben shocked the world using Leyden jars and a crude vandegraaff generator to demonstrate the power of electricity.
upload_2020-6-19_8-12-16.png

Couldn't help but wonder if the old "Pickle jar" - would work as your crude cap to inject the audio into your amp?
upload_2020-6-19_8-8-43.png

It might be a good idea to take the covers off that unit and see if you can cut to the chase and see which concepts they've supplied. Either the transformer coil coupling, or capacitor - or something even more exotic for you.

One of the things I had to deal with in an earlier life was Computer power supplies for the PS2 (IBM XT platforms) that required both a positive and negative voltage with a common neutral or ground for the TTL tri-state I see a possibility to use this method to obtain the voltage differences needed for the conversion of an Audio (essentially an AC signal) into a working "collector" or Plate Modulation technique for the push pull design.

It would be prudent to see how they assembled the output network to drive the loudspeakers together.
 
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Tokin

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I thought about that amplifier last night...

It has me wondering if we had a means to drive into a load - like a loudspeaker...but into an amp.

Why not make one a modulation transformer in such a fashion that you could pips the audio into the amp - kinda like a push pull - using one channel for each side?

I imagine this would need something like 8 AWG wire (enamled) along a form and tapped...

Then the crazy stuff piped into the dream...

Leyden jars - the old archaic versions of the Electrolytic caps we take for granted today...

Leyden%20Jar%20Diagram_5C20.30.jpg
Since the power handling of a typical simple electrolytic may be exceeded - thought that the older versions might be safer

There is an anecdotal story that I read as a child ...
827430.jpg

And with Kopcicle posting images of toasted rodents...

There's a bit of a humorous chapter in the book about how Ben shocked the world using Leyden jars and a crude vandegraaff generator to demonstrate the power of electricity.
View attachment 38245
Couldn't help but wonder if the old "Pickle jar" - would work as your crude cap to inject the audio into your amp?

It might be a good idea to take the covers off that unit and see if you can cut to the chase and see which concepts they've supplied. Either the transformer coil coupling, or capacitor - or something even more exotic for you.

One of the things I had to deal with in an earlier life was Computer power supplies for the PS2 (IBM XT platforms) that required both a positive and negative voltage with a common neutral or ground for the TTL tri-state I see a possibility to use this method to obtain the voltage differences needed for the conversion of an Audio (essentially an AC signal) into a working "collector" or Plate Modulation technique for the push pull design.

It would be prudent to see how they assembled the output network to drive the loudspeakers together.

Very interesting idea though thats way over my head lol.
I found a local shop whos tech worked for Crown for 25 years so i think ill drop it off and let him go thru it and make sure its working as it should then decide what to do with it.
 
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Tokin

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sunbulls

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What I mean about not being rare is that Crown made a ton of similar models, plus or minus a few features. Besides some home audio aficionados, all of these high power amps are well suited as a church PA or auditorium system. Any large outdoor concert worth their weight will naturally use several high power amps.

Our old and very high cathedral ceiling church had a pipe organ. It became too costly to maintain. We replaced it with a Yamaha keyboard, mixer, and a high power amp. The undistorted low end bass that is achieved by using a high power system is simply awesome. Four large speakers were placed high and across the back of the church. Most of the old folks were amazed those sounds could come from such a small keyboard. It was a real bargain compared to the cost of rebuilding a pipe organ. Just saying, with the addition of a mixer / equalizer or preamp, that Crown amp would also fit in as a main or backup just as well.
 

nomadradio

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One common way to apply this amplifier in an industrial setting is to drive large solenoids instead of speakers. The solenoid shafts hold up the corners of a table. Gadgets you wish to test for "shake tolerance" get strapped to the table. A waveform generator that moves the table up and down in the desired pattern and frequencies feeds into the amplifier.

You can simulate the shock and vibration of mounting a radio in a truck, driving down a road full of potholes.

Don't know just how large a "shaker table" you could drive with this amp, but that's the kind of thing they built it to do. Hence the phrase "power supply" in the description.

73
 

sunbulls

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I know the specifications state different industrial uses, but trying to find a buyer for that intended purpose would be difficult at best. I believe its greatest monetary value and salability is in being a valid audio amp like all the rest of its brothers. For normal audio amplification, I’m betting you wouldn’t even need to engage the fans.
 
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