Hi
I have 6 of these amps (schematic attached.) taken out of a hospital and am trying to hook them up to my Yamaha reciever for an awesome looking home theater system but can't figure out what to do to get them to work. They worked in the hospital but I don't know enough about circuits to figure them out. I know I have to remove the step-up tranformer as it generates 70 volts, but what eles do I have to do. Audio in on the N1 & C terminals, out before T1 but the amps don't seem to turn on ( power is on). Ideas????
Thanks for reading.
Scott
I have 6 of these amps (schematic attached.) taken out of a hospital and am trying to hook them up to my Yamaha reciever for an awesome looking home theater system but can't figure out what to do to get them to work. They worked in the hospital but I don't know enough about circuits to figure them out. I know I have to remove the step-up tranformer as it generates 70 volts, but what eles do I have to do. Audio in on the N1 & C terminals, out before T1 but the amps don't seem to turn on ( power is on). Ideas????
Thanks for reading.
Scott
Attachments
Hi Scott,
Djk is right, they look like they will sound nasty (as in horrible).
You did get free chassis and transformers plus whatever else is useable. Why not build a DIY amp project? Build one and once it's going, build the rest. You are correct that the 70V line transformers must go.
-Chris
Djk is right, they look like they will sound nasty (as in horrible).
You did get free chassis and transformers plus whatever else is useable. Why not build a DIY amp project? Build one and once it's going, build the rest. You are correct that the 70V line transformers must go.
-Chris
Altough this schematic that you have posted is almost unreadable, it's quite easy to identify a push-pull topology in it.
In other words: These amplifiers won't work without output transformers.
In other words: These amplifiers won't work without output transformers.
Awsome looking, maybe, but not awsome sounding. Not being snobbish. These look like on old PA system. The output transformer is a giveaway. They will probably sound like a PA system. Maybe not a bad as listening to music over the telephone. . .
thanks for the ideas , I will look into making the amps. The rack with 6 of these amps in it look real cool.
You can still use the enclosures, just putt beeter stuff in them. Saves a lot of money, too. It may even be possible to salvage the transformers and other power supply parts.
A neat idea but would the final result be any better than just using the Yamaha? Right now I have it powering 6 mission bookshelf speakers & 2 100 watt subs, plus a Harman Karden (200 watt) powering 6 AR satelites speakers and a 100 watt sub. The goal is to use all the speakers but only one source as with two, the sound seperation gets a little blended. This is in a large rec room mainly for movies. As you can imagine I like a full sounding system.
Thanks Scott
Thanks Scott
Hi Scott,
I like Yamaha and fixed them under warranty for years. You can do better with the external amps. Yamaha make really good processors. They do not make really robust amplifiers. Not in receivers anyway.
-Chris
I like Yamaha and fixed them under warranty for years. You can do better with the external amps. Yamaha make really good processors. They do not make really robust amplifiers. Not in receivers anyway.
-Chris
Since you need a lot of amps, you could buils P3As from ESP sound.au.com
2 per PCB. Generally though highly of here abouts.
2 per PCB. Generally though highly of here abouts.
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