Threshold fet ten/pc schematics - diyAudio
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Old 17th September 2004, 07:40 PM   #1
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Default 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.
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Old 14th November 2004, 07:51 PM   #2
aht is offline aht  Thailand
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Thumbs up 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"
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Old 14th November 2004, 08:15 PM   #3
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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
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Old 15th November 2004, 07:55 AM   #4
aht is offline aht  Thailand
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Talking 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
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Old 16th November 2004, 04:51 AM   #5
aht is offline aht  Thailand
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Default File for line amp

Nice & Easy
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Old 17th November 2004, 05:29 PM   #6
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Default Re: File for line amp

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.

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Old 18th November 2004, 04:52 AM   #7
SkyChu is offline SkyChu  Taiwan
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Excuse me ! Why I don't see the RIAA network in your schematic ?
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Old 18th November 2004, 08:19 AM   #8
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Default 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.
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Old 19th November 2004, 07:47 AM   #9
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Default comimg soon

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)
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Old 23rd November 2004, 05:30 AM   #10
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I have trouble obtaining 2N4393 over here. Is PMBF4393 an equivalent? if not, can anyone advise on a substitute?
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