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Tweakers' Asylum: Re: Okay, thanks. <nt> by john curl Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Okay, thanks. <nt> posted by groman on January 6, 2002 at 14:32:23:
Groman, you are making it tough on yourself. If you are using a differential input, then try to find a 2SK389. It is a great matched pair, and I use them by the thousands. I also use them in my $10,000+ preamp, they are that good. They also have a complement, the 2SJ109 that is slightly harder to find, but works well also. Elso and I are not trying to discourage you, but to get you started right. The single devices will be difficult to match. I know because I have designed them into many of my products, before the 2SK389 was available. The 2SK117 is NOT an optimum input part, because it has much lower Gm than the 170 or the 389. It does have slightly higher voltage, but you should not operate it at such high voltages, because it will leak and create noise and offset. However the 2SK117 would be an OK cascode part with a 170 or 1/2 a 389 at the bottom of the cascode. Then you can get up to 70 V operation without too much compromse. You also must be careful about the Idss rating of the devices Most Japanese parts have 3 or 4 ranges. Get the highest range V, if you can or Bl which is the next highest. Gr and Y is OK for portable, miniature apps, but will be harder to to get right. I
If you can't find the 2SK389 in your one source, do a search on the NET for the part. You should find someone in your area who can help you, or go to Borbeley Audio in Germany. I don't know their exact website location, but it exists.
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Topic - OPamplifiers, Replacements - groman 02:37:11 01/5/02 ( 89)
- Already Had This Discussion Just A WHile Ago - Jon Risch 16:40:52 01/6/02 ( 3)
- Re: Already.. Take a look! Here.... - groman 17:28:13 01/6/02 ( 2)
- Re: Already.. Take a look! Here.... - Jon Risch 21:06:55 01/6/02 ( 1)
- Thanks, Jon. - groman 00:11:13 01/7/02 ( 0)
2SK117 or 2SK170 input stage? - groman 08:26:09 01/6/02 ( 10)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - Elso Kwak 08:30:24 01/6/02 ( 9)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - groman 11:42:32 01/6/02 ( 8)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - capslock 10:34:58 01/7/02 ( 3)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - Elso Kwak 13:32:42 01/7/02 ( 0)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - john curl 12:00:23 01/7/02 ( 1)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - john curl 13:09:00 01/7/02 ( 0)
- Re: 2SK117 or 2SK170 input stage?Better use 2SK389 - Elso Kwak 13:04:17 01/6/02 ( 3)
- Okay, thanks. <nt> - groman 14:32:23 01/6/02 ( 2)
- Re: Okay, thanks. <nt> - john curl 01/6/02 15:15:53 01/6/02 ( 1)
- It is 6-14mA-117 - groman 17:50:55 01/6/02 ( 0)
join Thread in SET asylum; Single Ended Class A paper - groman 08:12:09 01/6/02 ( 0)
My DesignPhilosofy - groman 06:22:35 01/6/02 ( 0)
Links to W. Jungs Articles.... - Thorsten 16:54:36 01/5/02 ( 5)
- Re: Links to W. Jungs Articles....And a Bit of Help - Elso Kwak 03:39:39 01/6/02 ( 1)
- App notes, can be tutorial, Thanks! - groman 06:12:05 01/6/02 ( 0)
one more.... - Thorsten 16:57:40 01/5/02 ( 2)
- Re: one more.... - john curl 14:19:45 01/6/02 ( 1)
- Re: one more.... - Thorsten 12:06:25 01/8/02 ( 0)
Re: OPamplifiers, Replacements - Brian T. 16:22:32 01/5/02 ( 1)
- Seen LT1028 in RIAA-amps - groman 19:38:06 01/5/02 ( 0)
AD797 internal design attracts me. - groman 11:34:47 01/5/02 ( 17)
- If so, then look at the AD811 or LM6171/72/6181/6182 and co.... - Thorsten 13:14:36 01/5/02 ( 16)
- Re: If so, then look at the AD811 or LM6171/72/6181/6182 and co.... - capslock 14:24:54 01/6/02 ( 0)
- Re: If so, then look at the AD811 or LM6171/72/6181/6182 and co.... - Elso Kwak 02:33:44 01/6/02 ( 13)
- Thorsten will learn, someday..... - groamn 05:57:53 01/6/02 ( 11)
- Or maybe I have already learned and found some of the answers you are seeking? - Thorsten 06:45:19 01/6/02 ( 10)
- Apologies for bad expression! Thorsten - groman 00:31:43 01/7/02 ( 0)
- Re: Or maybe I have already learned and found some of the answers you are seeking? - Elso Kwak 07:39:46 01/6/02 ( 8)
- Re: Or maybe I have already learned and found some of the answers you are seeking? - Thorsten 08:00:56 01/6/02 ( 7)
- Re: Or maybe I have already learned and found some of the answers you are seeking? - terryb 11:37:49 01/6/02 ( 1)
- Re: Or maybe I have already learned and found some of the answers you are seeking? - Thorsten 12:11:04 01/8/02 ( 0)
- Re: Or maybe I have already learned and found some of the answers you are seeking? - Elso Kwak 08:26:42 01/6/02 ( 4)
- Re: Or maybe I have already learned and found some of the answers you are seeking? - Thorsten 09:05:36 01/6/02 ( 3)
- Re: Valid Comparison? - Elso Kwak 13:17:15 01/6/02 ( 2)
- Re: Valid Comparison? - Thorsten 03:42:47 01/7/02 ( 0)
- Re: Valid Comparison? - Ric Schultz 22:36:46 01/6/02 ( 0)
Re: If so, then look at the AD811 or LM6171/72/6181/6182 and co.... - Thorsten 05:24:15 01/6/02 ( 0)
Re: If so, then look at the AD811 or LM6171/72/6181/6182 and co.... - groman 14:09:15 01/5/02 ( 0)
Another bit of reading..... - Thorsten 06:54:05 01/5/02 ( 10)
- Re: Another bit of "reading"..... - Elso Kwak 02:38:51 01/6/02 ( 1)
- Re: Another bit of "reading"..... - Thorsten 05:25:36 01/6/02 ( 0)
Re: Another bit of reading..... - john curl 15:11:19 01/5/02 ( 0)
my philosophy in design of amps - groman 07:42:08 01/5/02 ( 6)
- Constant current source vs. resistor. Differences? - groman 08:44:56 01/7/02 ( 5)
- Re: Constant current source vs. resistor. Differences? - Elso Kwak 13:17:29 01/7/02 ( 4)
- you did not quite understand - groman 15:16:49 01/7/02 ( 3)
- Re: you did not quite understand - Elso Kwak 23:42:40 01/7/02 ( 2)
- Current >T1 at the same time as current >T2, can not... - groman 14:53:02 01/8/02 ( 1)
- Re: Current >T1 at the same time as current >T2, can not... - Elso Kwak 02:09:12 01/9/02 ( 0)
Re: OPamplifiers, Replacements - John S. 04:36:26 01/5/02 ( 8)
- MBL 6010 uses NE5534 for preamp and it costs US$13,800. - jameshin 11:56:59 01/5/02 ( 1)
- Is that NE5534A??? - groman 13:01:07 01/5/02 ( 0)
How do you unsolder DIL8? - groman 05:45:32 01/5/02 ( 5)
- Re: How do you unsolder DIL8? - Brian T. 16:33:30 01/5/02 ( 0)
Unsoldered JRC 4558 from Pioneer PD-S504 - groman 07:06:32 01/5/02 ( 1)
- Re: Unsoldered JRC 4558 from Pioneer PD-S504 - John S. 12:22:03 01/5/02 ( 0)
Re: How do you unsolder DIL8? - John S. 06:44:01 01/5/02 ( 0)
Re: How do you unsolder DIL8? - Thorsten 06:37:12 01/5/02 ( 0)
Re: OPamplifiers, Replacements - Thorsten 03:13:10 01/5/02 ( 25)
- Any better Comparision? Suggestion??? - groman 03:27:09 01/5/02 ( 24)
- Re: Any better Comparision? Suggestion??? - tvi 05:48:56 01/5/02 ( 7)
- Re:Any better Comparision? Suggestion???Just Listen to the Music!!! - Elso Kwak 03:25:57 01/6/02 ( 2)
- Is it the one JFET-opamp? 2SK170/2SJ - groman 05:50:03 01/6/02 ( 1)
- Re: Is it the one JFET-opamp? 2SK170/2SJ. No this a other One - Elso Kwak 07:24:56 01/6/02 ( 0)
- Re: really great site - look at the Distortion in capacitors section..... - Thorsten 06:45:37 01/5/02 ( 1)
- Re: really great site - look at the Distortion in capacitors section..... - john curl 00:17:37 01/8/02 ( 0)
- Great Site!!! Thank you, tvi (fb=4) - groman 05:58:17 01/5/02 ( 1)
- Translation from Japanese into english of sorts via: - Thorsten 06:41:11 01/5/02 ( 0)
Re: Any better Comparision? Suggestion??? - Thorsten 04:29:37 01/5/02 ( 15)
- Re: Any better Comparision? Suggestion??? - Graham C 10:30:37 01/5/02 ( 10)
- Re: Any better Comparision? Suggestion??? - Thorsten 13:06:11 01/5/02 ( 4)
- Re: Any better Comparision? Suggestion??? - Graham C 15:02:38 01/5/02 ( 2)
- Re: Any better Comparision? Suggestion??? - Thorsten 16:16:22 01/5/02 ( 1)
- Re: Any better Comparision? Suggestion??? - john curl 00:40:37 01/8/02 ( 0)
- Self stuff maybe not up to date? - groman 13:23:03 01/5/02 ( 0)
5532, still worth the price! - groman 11:02:01 01/5/02 ( 4)
- Re: 5532, still worth the price! - john curl 15:23:58 01/5/02 ( 1)
- Agree, see 'Self stuff maybe is...' <nt> - groman 16:03:41 01/5/02 ( 0)
Re: 5532, still worth the price! - Thorsten 13:09:44 01/5/02 ( 1)
- HaHa, you little devil!!! 5532 is superior! - groman 13:30:27 01/5/02 ( 0)
Re: Any better Comparision? Suggestion??? - tvi 05:54:55 01/5/02 ( 2)
- Re: Any better Comparision? Suggestion??? - Robin Cook 14:08:02 01/5/02 ( 1)
- Re: Any better Comparision? Suggestion??? - Robin Cook 14:13:38 01/5/02 ( 0)
Will read. Thanks T! (fb=4) - groman 05:39:19 01/5/02 ( 0)