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17th June 2008, 12:24 PM
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#1 |
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diyAudio Member
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
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XPP amp
Tube Cad has a little discussion of the XPP amp circuite. It looks like a depletion mode mosfet like the dn2540n5 would be easy to
use for the output stage but what would the output impedience be? The original circuite discription calls for using the plate resistance in the output resistance calculation does a mosfet have a similar rating to plate resistance? I just thaught it might be neat for a headphone amp. |
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17th June 2008, 10:02 PM
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#2 |
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diyAudio Member
Join Date: Dec 2001
Location: Hickory, NC
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The circuit depends on the bottom tubes having the same Mu factor or voltage gain, so their plate voltages track. So a Mosfet output will not work without big changes. (a Mosfet having a high output Z like a pentode, and very high Mu effectively) You could replace the top tubes with depletion mode Mosfets readily.
Don
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