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Old 22nd June 2001, 02:39 AM   #1
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Does anyone know of any jfet-based srpp preamp?
I know this is very popular among tube amp fans,
I am considering building one.

Any pointers to tips/tricks and websites would be
highly appreciated.

Thanks in advance,
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Old 23rd June 2001, 01:39 AM   #2
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(is it Vidal?)

The reason for using SRPP is as I understand it the lack of positron tubes.

Why not consider something with p-channel devices instead?

Regardless of this, there is no reason why you should not replicate a tube SRPP with alternative devices.

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Old 23rd June 2001, 02:49 AM   #3
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Lightbulb SRPP

No, I don't think that's the reason for SRPP. Check out http://www.tubecad.com .. lotsa SRPP explanations..
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Old 23rd June 2001, 03:30 AM   #4
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Uhm, well, I have a Hafler SE100 preamp which is an
all-JFET design. Diff amp input and a complementary
output that appears to have a 2 uF coupling cap only
for turn-on DC transients. Does that fet the

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Old 24th June 2001, 12:07 AM   #5
lohk is offline lohk  Europe
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You probably could mean Jack Orman's MINIBOOSTER (and it's derivates), which is basically a JFET SRPP schematic. You should find it at http://www.muzique.com/amz/ .
Mention: This amp is considered as a guitar preamp (with intended smooth distortion properties), so the values of the parts have to be changed somehow to fit it into the hifi world.
I can sent a little gif to you per mail, if you don't find it.

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Old 25th June 2001, 02:11 AM   #6
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Default Re: jfet srpp preamp


Thanks for all the responses.
The reason for the n-ch only amp is more an
experiment to gauge (at least for myself) if
jfets hv any tube-like properties as far as
audio is concerned. It is particularly attractive
because of it's flexibility with its use of -ve bias.
I was thinking of using it as an output buffer for
a dac.

p-ch jfets usually do not match all that identically with
n-ch devices, as with all other bjts, mosfets etc.
Plus, one can get dual matched jfets in a single

Currently, my understanding leads me to
think that all the analysis for tube srpp amps
are applicable to jfets, with minor modifications.
Conclusions like optimum resistor loading,
mu followers, etc should be useable too.

Inputs appreciated, as always.

Yves H (not Vidal)
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Old 7th February 2004, 02:21 PM   #7
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Default SSRP JFET outputstage

Try to look here:


Isn't that exactly an SSRP outputstage?

- Peter
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Old 7th February 2004, 06:55 PM   #8
vuki is offline vuki  Croatia
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I think there is jfet SRPP phono preamp in new Elektor magazine.
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Old 23rd June 2012, 11:19 AM   #9
tinitus is offline tinitus  Europe
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just tumbled over this old thread

sorry to 'reopen', but thought it looked.... hmm.....interesting
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Old 23rd June 2012, 12:09 PM   #10
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Originally Posted by tinitus View Post
just tumbled over this old thread

sorry to 'reopen', but thought it looked.... hmm.....interesting
I think the mentioned thread is very secret
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