From diyparadise.com...
Here's the article
An externally hosted image should be here but it was not working when we last tested it.
Here's the article
There are a few circuits for the 5687. Here is one I built using Magnaquest B7 transformers. It sounds excellent.
http://home.t-online.de/home/MHuber/pre-5687.htm
http://home.t-online.de/home/MHuber/pre-5687.htm
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