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Old 4th April 2013, 09:21 PM   #9611
Salas is offline Salas  Greece
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That is where BJTs excel but Fets like the 389 near a lot.
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Old 4th April 2013, 09:24 PM   #9612
RCruz is offline RCruz  Switzerland
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You just convinced me... must buy some 389 soon.
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Old 4th April 2013, 09:26 PM   #9613
Salas is offline Salas  Greece
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1x 389 input folded simplistic gave me -100dB 1/F @ 20Hz. Same as with the Paradise.

*2x 389BL would be more fair since the gains of the two circuits would be nearer.
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Old 4th April 2013, 09:36 PM   #9614
RCruz is offline RCruz  Switzerland
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So that is wha i need now.... I felt the 4 x k170 lacked bass grip and is noisier than the 2 x k170 build.

Inittially I wondered if that noise came from the 12ohm Rs used... I was now recalculating the folded ccs resistor to lower these Rs to 3.9ohm... but now I know better... where can I get some good 389 ... ampslab ?
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Old 4th April 2013, 09:43 PM   #9615
Salas is offline Salas  Greece
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Yes, 2SK369BL actually, 389 is a K170 extinct double. My typo.
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Old 4th April 2013, 09:46 PM   #9616
Salas is offline Salas  Greece
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So that is wha i need now.... I felt the 4 x k170 lacked bass grip and is noisier than the 2 x k170 build.
Its you neared 65dB gain with not the best type for 1/F noise.
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Old 4th April 2013, 09:52 PM   #9617
RCruz is offline RCruz  Switzerland
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Would you care to share your best 369 source ?
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Old 4th April 2013, 10:07 PM   #9618
Salas is offline Salas  Greece
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I don't have any best source. I had 20-30pcs that I got from Ebay once. Cowboy legged ammo tape ones that proved OK.
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Old 8th April 2013, 09:02 AM   #9619
massimo is offline massimo  Italy
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Just finished k117gr mod on V12r vref.... much faster catch up indeed....
Ricardo, which Idss did you chose for the K117 in this position?
or
Salas, which is the reccomendend Idss for the K117?

Thank you both!
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Old 8th April 2013, 09:20 AM   #9620
RCruz is offline RCruz  Switzerland
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I am using 30kr for vref so I need around 1mA to get 35Vout.

I chose a K117GR with 3.6mA Idss... the trimmer on the gate reduces this value to the correct Id.
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