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28th November 2009, 06:31 PM
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diyAudio Member
Join Date: Aug 2005
Location: Zadar, Croatia
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50FE5-push pull stereo
Small stereo push-pull amp with 2x6201 (ECC81/12AT7) and 4x50FE5 tubes with 30VA main transformer (115V+115V/15V+15V; "C"-core), and isolation transformer (230V/115V) as a main transformer. Not need feedback in output triode-mode, but sound good in pentode-mode also. Output tubes works in class A with Ia~100-105mA each. Maksimum output power is 2x~10W in pentode-mode, and ~2x4W in triode-mode. Very small inner resistance and good linearity of output tubes provides very good sound in pentode-mode, like some another tubes in triode-mode.
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