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Old 15th March 2010, 05:16 PM   #3231
RCruz is offline RCruz  Switzerland
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I agree... but we must know the values of the resistors... particularly the 47k, 3k3, 1M 6k8.
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Old 15th March 2010, 05:21 PM   #3232
Salas is offline Salas  Greece
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Ricardo is the main man now. Its his turf. Listen to him Merlin.
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Old 15th March 2010, 05:50 PM   #3233
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I am very, very infuriated, I have paid to Parts Connexion extra money for matched pairs & I have received:

Channel Left:
R3 47K
R4 6K8
R5 1Meg13

Channel Right
R3 46K8
R4 6K9
R5 998K

Thks in advance Ricardo let me know how can do with these mix.

Last edited by merlin el mago; 15th March 2010 at 05:54 PM.
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Old 15th March 2010, 06:18 PM   #3234
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Looking for at Swap Meet I have seen a interesting thread selling Toshiba 2SK170V

Toshiba 2SK170-V for sales

Due to the fact that V series have a Idss classification of V: 10-20mA will be perfect for everybody to want do the same simplistic that I have done, gain 63dB@1Khz Low MC 10.5mA Idss
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Old 15th March 2010, 06:22 PM   #3235
massimo is offline massimo  Italy
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Quote:
Originally Posted by merlin el mago View Post
Looking for at Swap Meet I have seen a interesting thread selling Toshiba 2SK170V

Toshiba 2SK170-V for sales

Due to the fact that V series have a Idss classification of V: 10-20mA will be perfect for everybody to want do the same simplistic that I have done, gain 63dB@1Khz Low MC 10.5mA Idss

That should be good especially for the front end....
But what happens if you sort out some pairs matched for 15 - 16 mA? Isn't too much if they are going to work with 5mA?
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Old 15th March 2010, 06:30 PM   #3236
Salas is offline Salas  Greece
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Can anybody who got V from that sale, measure say 10 random pcs and tell me the average?
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Old 15th March 2010, 06:33 PM   #3237
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Quote:
Originally Posted by massimo View Post
That should be good especially for the front end....
But what happens if you sort out some pairs matched for 15 - 16 mA? Isn't too much if they are going to work with 5mA?
There is 3 Idss classifications for 2SK170
GR: 2.6-6.5mA
BL: 6.0-12mA
V: 10-20mA

If you buy a batch of 100 pcs surely you have enough to your project.
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Old 15th March 2010, 06:37 PM   #3238
massimo is offline massimo  Italy
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V grade jfets are generally used in amp front end, or by John Curl.... (hat off!)
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Old 15th March 2010, 06:42 PM   #3239
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Quote:
Originally Posted by Salas View Post
Can anybody who got V from that sale, measure say 10 random pcs and tell me the average?
Is possible to increase the gain increasing the Idss with no penalty noise, I ask for the people has ultra-low MC carts 0.1-0.2?
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Old 15th March 2010, 06:48 PM   #3240
Salas is offline Salas  Greece
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Not really, those carts have very low impedance too, and Jfets become more noisy in the lows then. For such very difficult situations its either staying away from such carts or going specialized BJT head amps. Look in Syn08's and Gerhard's threads for more on that.
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