Threshold fet ten/pc schematics

audiogod · 17th September 2004, 06:40 PM

I have a threshold phono pre with a bad hum problem, and my tech needs the schematic for it to be fixed. I would really appreciate some help in getting it asap. Thanks.

aht · 14th November 2004, 06:51 PM

http://www.aht.8m.net/AHT%20DIFFETO%...O%20DELUXE.htm

My first project is Threshold Fet-10 in a new name "Diffeto Deluxe"

janneman · 14th November 2004, 07:15 PM

Looks like a great project, well executed. Of course I couldn't read it. And your site throws up a lot of very annoying and intrusive pop-ups. One time only..

Jan Didden

aht · 15th November 2004, 06:55 AM

my website has created in Thailand sorry with Thai language. threshold Fet-10 has an easy designed and it operated in a following method.

1.In put with differential J-fet and ccs by resistor
2.Second stage with common collectorfor for matcing high to low impedance with 1 transistor run with class-a
3.Out put with common emitter in 1 transistor run with class-a
4.Schematic coming soon

Thanks

AHT

aht · 16th November 2004, 03:51 AM

Nice & Easy

commstech · 17th November 2004, 04:29 PM

Quote:

Originally posted by aht
Nice & Easy

Sawadee Kraap Pee AHT,
Values of C5 and R15 overlaps in the circuit. may i know what is the value? What is the trimpot R11 for? What adjustments to i make to get what readings?

Kaup Koon Kraap.

SkyChu · 18th November 2004, 03:52 AM

Excuse me ! Why I don't see the RIAA network in your schematic ?

aht · 18th November 2004, 07:19 AM

62pF & 100K every value you can change for the best result. If anybody use circuitmaker2000 can email to me for a simulated file. My new project is AlephX100 in another patent of Passlabs + Aleph P1.7 preamplifier if you want some pcb files can mail to me too.

aht · 19th November 2004, 06:47 AM

riaa coming soon. Now i build AlephX100 and use fet-10 for preamp it's sound so good and better than Aleph P1.7 (In my mine)

commstech · 23rd November 2004, 04:30 AM

I have trouble obtaining 2N4393 over here. Is PMBF4393 an equivalent? if not, can anyone advise on a substitute?

17th September 2004, 06:40 PM	#1
audiogod diyAudio Member Join Date: Sep 2004 Location: Vancouver	Threshold fet ten/pc schematics I have a threshold phono pre with a bad hum problem, and my tech needs the schematic for it to be fixed. I would really appreciate some help in getting it asap. Thanks.

14th November 2004, 06:51 PM	#2
aht Account Disabled Join Date: Nov 2004 Location: thailand	Following address can help you a little bit http://www.aht.8m.net/AHT%20DIFFETO%...O%20DELUXE.htm My first project is Threshold Fet-10 in a new name "Diffeto Deluxe"

14th November 2004, 07:15 PM	#3
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Looks like a great project, well executed. Of course I couldn't read it. And your site throws up a lot of very annoying and intrusive pop-ups. One time only.. Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

15th November 2004, 06:55 AM	#4
aht Account Disabled Join Date: Nov 2004 Location: thailand	sorry with another language my website has created in Thailand sorry with Thai language. threshold Fet-10 has an easy designed and it operated in a following method. 1.In put with differential J-fet and ccs by resistor 2.Second stage with common collectorfor for matcing high to low impedance with 1 transistor run with class-a 3.Out put with common emitter in 1 transistor run with class-a 4.Schematic coming soon Thanks AHT

18th November 2004, 03:52 AM	#7
SkyChu diyAudio Member Join Date: May 2002 Location: Taiwan	Excuse me ! Why I don't see the RIAA network in your schematic ? __________________ Sky Chu


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18th November 2004, 07:19 AM	#8
aht Account Disabled Join Date: Nov 2004 Location: thailand	Ok...following value 62pF & 100K every value you can change for the best result. If anybody use circuitmaker2000 can email to me for a simulated file. My new project is AlephX100 in another patent of Passlabs + Aleph P1.7 preamplifier if you want some pcb files can mail to me too.

23rd November 2004, 04:30 AM	#10
commstech diyAudio Member Join Date: Oct 2002 Location: SINGAPORE	I have trouble obtaining 2N4393 over here. Is PMBF4393 an equivalent? if not, can anyone advise on a substitute?

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