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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 3rd April 2009, 09:04 PM   #1581
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
If the sensitivity of your main amp or the drive in the lows, proves below expectations when directly driving from the phono through a pot, make a 12B4A tube preamp with 6k8 10W anode load, 1k2 cathode resistor bypassed with BGN. B+ 320V. Gain measured=X3.56. Sounds much more grand in everything than JFET line anything and the gain is adequate for modern systems. Just 1 stage triode with low output impedance. Can't get any simpler really. Of course high voltages are for the careful experimenter.
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Old 4th April 2009, 07:02 PM   #1582
nicoch58 is offline nicoch58  Europe
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sand6db

But Salas suggestion are nice....
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Old 5th April 2009, 07:07 PM   #1583
nicoch58 is offline nicoch58  Europe
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crazy
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Old 6th April 2009, 07:14 AM   #1584
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
See post #133
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Old 6th April 2009, 08:16 AM   #1585
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
It is 1k because that is how I liked the Denon to be loaded. You are free to put 47k instead for your Sumiko. Don't add 250pF capacitance as Sumiko says on its data, that circuit provides enough pF by itself.
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Old 6th April 2009, 10:06 AM   #1586
pajonec is offline pajonec  Thailand
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Salas, I read a lot for this topic, Now I have Sumiko blue point EVO III cartridge, I want DIY phono stage matching my cartridge impedance for my system. Could you please help and suggest?

BLUE POINT SPECIAL EVO IIITM
High Output Moving Coil
Frequency Response: 12 Hz. - 50 kHz.
Output Voltage: 2.5 mV per channel at 1 kHz.; 5 cm./sec. peak recorded velocity. Output from each channel within 2 dB.
Channel Separation: Minimum 35 dB at 1 kHz.
Channel Balance: Within 0.5 dB.
Optimum Load: 47, 000 ohms resistance in parallel with 250 to picofarads total capacitance.

Cheer!
pajonec
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Old 6th April 2009, 10:06 AM   #1587
pajonec is offline pajonec  Thailand
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Salas, Please suggest me, R8 is 1k or 47k ?

Cheer!
pajonec
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Old 6th April 2009, 10:06 AM   #1588
pajonec is offline pajonec  Thailand
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Many thank Salas
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Old 6th April 2009, 05:55 PM   #1589
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Quote:
Originally posted by nicoch46
sand6db

But Salas suggestion are nice....
Thank you nicoch46

I like the idea of no caps... Did you hear it ?

Ricardo

PS: Look at the complexity : http://www.youtube.com/watch?v=VZM8i...eature=related
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Old 6th April 2009, 06:05 PM   #1590
nicoch58 is offline nicoch58  Europe
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I dont know ! better then opa

but is nice that have an upgrade to play and with F5...

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