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4S Universal Preamplifier for 12A*7 Tubes [Project]
posted December 18 2013 10:40.38 by spic0m




The basis for this tube preamplifier started out as a post in the Super simple single stage tube preamp thread on the website Forum. One of the members (see Mark's 4S Universal Valve Preamps) had suggested building a Super Simple Single Stage Preamp ("4S" Preamp for short) and there was much discussion concerning various tubes, gain, noise, etc. and several designs were presented using various dual triode tubes. Then the proverbial gauntlet was thrown down with the phrase "switch from 12AU7 to 12AX7". The answer was to design a universal line stage preamplifier that would work well with an entire range of tubes. Thus was the 4S Universal tube preamplifier born.


[Link: DIY Audio Projects]
 
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