To start, let me say that this site has given me a wealth of information that i consider irreplaceable. so for that, i say thank you to all that contribute.

I need to construct a standalone 80W, 120V AC to 24V DC power supply for a 1974 Fender Rhodes electric piano. I have already rebuilt it's preamp and am using a purchased power supply but am having tons of problems. I believe my current power supply is in some way causing phasing and/or ground issues with the preamp and makes it go haywire when plugged directly into a speaker. Anyhow, i figure a basic and generic power supply should do the trick. The original equipment is definitely vintage, so that means no ICs.

I found this schematic for a simple power supply:
http://www.aaroncake.net/circuits/supply6.asp

I also found this 80W transformer to use:
http://www.hammondmfg.com/pdf/5c0022-23.pdf

My biggest problem is finding a regulator that will output 24V and handle 3.3A. As far as i can tell, they don't exist. (i could be wrong, and probably am)

Any advice on a good solution? perhaps a different schematic? I'm open to all kinds of ideas. Keep in mind this is an audio application, so clean power is a must!

 

Follow the link and get the LM7824 datasheet - http://www.datasheetcatalog.com/datasheets_pdf/L/M/7/8/LM7824A.shtml

Figures 12 and 13 show you how to get the extra current output. You will need to mount the pass transistor on a heat sink.

 

Not quite what you asked for, but...

http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=12940

Sometimes it is cheaper to buy than to make.

 

Similar to Bill Marsden's suggested supply, same price, but with terminal strips for connections:
http://www.mpja.com/email/06-09-09a.asp?r=%%ref%%&p=16854+ps

You may need to add extra filtering on the output.