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DIY & Tutorials
DIY For Audio
Nobsound preamp rebuild
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<blockquote data-quote="handsome" data-source="post: 1103399" data-attributes="member: 772"><p>The only caps in the circuit should be on the follower: 10uF and 0.1uF. You should direct couple the 12AU7 to the follower - get 135V on the plate of the paralleled 12AU7. For a paralleled pair of 12AU7s i get approx 11k on the anodes (or 22k on each anode) and approx 470 on cathodes (220 per cathode)?.you are paralleling a 12AU7 not cascading?</p><p></p><p></p><p>If you must put the volume on the output use a 10k pot. If the circuit is noisy with pot up front (where it should be really) relook your PSU. If it is humming check the grounding.</p></blockquote><p></p>
[QUOTE="handsome, post: 1103399, member: 772"] The only caps in the circuit should be on the follower: 10uF and 0.1uF. You should direct couple the 12AU7 to the follower - get 135V on the plate of the paralleled 12AU7. For a paralleled pair of 12AU7s i get approx 11k on the anodes (or 22k on each anode) and approx 470 on cathodes (220 per cathode)?.you are paralleling a 12AU7 not cascading? If you must put the volume on the output use a 10k pot. If the circuit is noisy with pot up front (where it should be really) relook your PSU. If it is humming check the grounding. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Nobsound preamp rebuild
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