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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Not questionable at all... posted by rickl on September 29, 2004 at 20:54:59:
Either preamp will drive this amp with 100K input impedance.
I don't know what their gain spec is and whether they can deliver more than 1-2 V RMS, so I will not recommend that you look at the low gain alternative tubes at this point. It gets a bit more involved and practically is a new design, even though you keep the same basic circuit. You'll have to make sure you have enough bias to not clip at the higher input and then adjust the input stage so it biases to the point where the direct-coupling to the splitter does not "choke" the splitter tube.
Unless you go back and forth on this "exercise" to reach an acceptable final circuit, I'd say you better just duplicate the 12AT7 circuit.
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- Preamp - serus 21:54:34 09/29/04 (0)
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