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Old 17th August 2009, 07:56 AM   #21
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Old 17th August 2009, 12:17 PM   #22
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Carpenter, in your attached schematic in post # 11, can't the input Mosfets be types with lower input capacitance than the IRF630s? What about BS170 and BS250? I forget which is N and which is P type but I remember using one of these in a Guitar preamp; when used for music input, it exhibited a very warm, tube like sound.
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Old 17th August 2009, 12:53 PM   #23
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Quote:
Originally posted by carpenter





In the meantime, if there's anything I can do for you... I'm a very good carpenter with a Sprinter van loaded with tools.

surprise him ;

make something exquisite like top part on your amp , and send ......

I know that I will , but I'm certainly hopeless with wood , comparing to you .

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Old 17th August 2009, 01:15 PM   #24
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For scaled down guitar amp triode+xformer (pp) outputs and "triode circuits" in general I've used a neat little feedback circuit with JFETs (2SK223 mostly), basic concept shown below. The output characteristic is pretty triode-like, and the basic sound as well. Don't know if it's good for HiFi, never tried (since it was deliberately designed to give specific distortion and overall sort of triode-like features).

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Old 17th August 2009, 02:16 PM   #25
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Quote:
Originally posted by Zen Mod



surprise him ;

make something exquisite like top part on your amp , and send ......

I know that I will , but I'm certainly hopeless with wood , comparing to you .

from Master to Master

You make a very good point.
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Old 17th August 2009, 02:20 PM   #26
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Quote:
Originally posted by Samuel Jayaraj
Carpenter, in your attached schematic in post # 11, can't the input Mosfets be types with lower input capacitance than the IRF630s? What about BS170 and BS250? I forget which is N and which is P type but I remember using one of these in a Guitar preamp; when used for music input, it exhibited a very warm, tube like sound.

Thanks for the tip.

Edit: I've modified R13 from .47 to .25 ohms. That means the little IRF630 mosfet is passing 5.5 amps. Obviously, a small signal transistor won't do the job in this particular situation.
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Old 17th August 2009, 09:37 PM   #27
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