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DIY For Audio
40% Tap direct to plate - any ideas?
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<blockquote data-quote="DEWAUDIO" data-source="post: 20717"><p>Hi there</p><p></p><p>This is one of those tricky situations...</p><p></p><p>Recently I have received an SE amp from a friend using a single 6C33C tube per channel with 25 watt Hammond output transformer.</p><p></p><p>The designer told me it produces only 11 watts from the circuit as the audio transfo's primary impedance is too high... (Alan Hobkirk)</p><p></p><p>Now I am thinking - the audio transformers are equipped with a "40% screen" (Blue with yellow stripe) tap on the primary. </p><p></p><p>Could I shift the plate connection from the "red" wire to the 40% screen tap to fool the tube in seeing a lower impedance coil. The red wire will be insulated and not connected then. (See my diagram)</p><p></p><p>The Hammond tranfo models are: 1640SE with 1250 ohm primary impedance and 40% screen tap.</p><p></p><p>This is just a thought... any ideas?</p></blockquote><p></p>
[QUOTE="DEWAUDIO, post: 20717"] Hi there This is one of those tricky situations... Recently I have received an SE amp from a friend using a single 6C33C tube per channel with 25 watt Hammond output transformer. The designer told me it produces only 11 watts from the circuit as the audio transfo's primary impedance is too high... (Alan Hobkirk) Now I am thinking - the audio transformers are equipped with a "40% screen" (Blue with yellow stripe) tap on the primary. Could I shift the plate connection from the "red" wire to the 40% screen tap to fool the tube in seeing a lower impedance coil. The red wire will be insulated and not connected then. (See my diagram) The Hammond tranfo models are: 1640SE with 1250 ohm primary impedance and 40% screen tap. This is just a thought... any ideas? [/QUOTE]
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DIY & Tutorials
DIY For Audio
40% Tap direct to plate - any ideas?
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