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RE: 5687 preamp

Posted by Stuben (A) on December 24, 2016 at 11:21:38

In Reply to: RE: 5687 preamp posted by Tre' on December 23, 2016 at 19:00:45:

I started with the simple design. I had a terrible time with noise. Ended up on the second iteration with a 5687 CCS loaded into a Parafeed arrangement with LL1674 opt and a nice Parafeed cap. The LL1674 is basically wired backwards for the least amount of voltage gain and a lower output impedance of around 200 ohm. The CCS plate loads have a great PS noise rejection with great plate loading. Apart from dealing with a 4 core output transformer, it's very simple.Started the project with plate chokes, could not get the noise floor down to a palatable level.

Stuben

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