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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Power amplifier posted by Zefiro on October 28, 2007 at 02:56:04:
Why so much gain? Mike Samra's remark about the 12AT7 is (IMO) spot on. The differential splitter/driver used in "El Cheapo" (schematic attached) has ALL the gain needed to drive no loop NFB PP triode wired EL34s, when a CDP is the source. Just ground the non-inverting triode's grid.
The 'T7 is EXTREMELY well suited to PP circuitry. The NET harmonic distortion spectrum is a PLEASING "waterfall", with 2nd > 3rd > 4th.
Eli D.
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