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The ARRL 2005 handbook and others describe a high power 28V DC supply suitable for medium power linears. I am offering a partial kit of components including a key, expensive transformer conservatively rated at 350Watts. About all you will need to build an unregulated version or a 12v version is a bridge rectifier plus a few inexpensive items.
Here is what you will receive
Transformer 120V prim 34v CT sec
2 Sprague electrolytics 22000 uF 25V DC and mounting clamp
DC Voltmeter 15V
Primary on-off switch, fuse holder and fuse, red panel light, AC line socket, 12V fan and guard

Price for all $30 plus actual shipping to your zip
FAR Circuits has a board to make life easy.
Paypal is preferred but most other means may also be acceptable.

GET SMARTER BUILD IT, SAVE a BUNCH

This was marked by the originator on Nov 21, 2009 as being sold.