Pars Posted October 27, 2017 Report Posted October 27, 2017 I haven't tried them, but those did look very interesting on the Linear site. Probably impossible to do an adapter board accommodating all comers, including the old 7-pin Toshiba duals, but maybe with the Linear round cans or SMD packages of these, plus the singles.
jose Posted October 27, 2017 Report Posted October 27, 2017 LSK489/LSJ689 looks good but I can't find where to buy them... OK, I only find trendsetter but shipping costs are terrible.
UFN Posted October 27, 2017 Report Posted October 27, 2017 If you're in the EU you should be able to buy from Micross in the UK https://shop.micross.com/products.aspx?i=14 - shipping cost is still a bit steep but not as bad as from Trendsetter. //UFN
jose Posted October 27, 2017 Report Posted October 27, 2017 If you're in the EU you should be able to buy from Micross in the UK https://shop.micross.com/products.aspx?i=14 - shipping cost is still a bit steep but not as bad as from Trendsetter. //UFNThanks!!! Add to my favourites. This is more reasonable. (17€ vs 120€ )LSK489 (To-71) 7,6€/unit but they haven't LSJ689
UFN Posted October 27, 2017 Report Posted October 27, 2017 6 hours ago, jose said: LSK489 (To-71) 7,6€/unit but they haven't LSJ689 Maybe ask them, because they are an official LS distributor so they should be able to get the whole range? //UFN
jose Posted October 28, 2017 Report Posted October 28, 2017 Thanks spritzer. Last night I saw a F5 with some modifications and this uses this device.
spritzer Posted October 28, 2017 Report Posted October 28, 2017 Hmmm not sure why anyone would cram an opamp in the F5... You could use the SSM2212/2220 combo.
jose Posted October 28, 2017 Report Posted October 28, 2017 Because sometime 2sk170/2sj74 are difficult to find.http://www.diyaudio.com/forums/showthread.php?t=312426
kevin gilmore Posted October 28, 2017 Report Posted October 28, 2017 lh0033 is a diamond buffer, and is VERY obsolete. I have a couple of originals somewhere.
spritzer Posted October 28, 2017 Report Posted October 28, 2017 16 minutes ago, jose said: Because sometime 2sk170/2sj74 are difficult to find.http://www.diyaudio.com/forums/showthread.php?t=312426 You could always swap for the Fairchild fets even if they aren't as good or just the new LSK/LSJ versions. Speaking of the F5, did anything come of the electrostatic version somebody was working on?
jose Posted October 28, 2017 Report Posted October 28, 2017 (edited) 0 noise. I'm using 2sk170/2sj74 [emoji1] With Toshiba Jfets is very stable, offset closed to 5~0 mVolt on both channels On R channel I'm using a THAT "good" (1 of 6) I hate this shit Edited October 28, 2017 by jose 2
mypasswordis Posted October 28, 2017 Report Posted October 28, 2017 3 hours ago, spritzer said: Speaking of the F5, did anything come of the electrostatic version somebody was working on? No idea but I came up with two versions of an electrostatic amp that has the Dynahi front end awhile back. They definitely need more tweaking so I will revisit, but I have been too busy learning CNC stuff recently. 2
Whitigir Posted October 28, 2017 Report Posted October 28, 2017 3 hours ago, mypasswordis said: No idea but I came up with two versions of an electrostatic amp that has the Dynahi front end awhile back. They definitely need more tweaking so I will revisit, but I have been too busy learning CNC stuff recently. That would come in extremely handy 1
jose Posted October 29, 2017 Report Posted October 29, 2017 thanks you guys. I have two channels working with 2SK170/2SJ74 and now I'm listening to new amp, seriously. No noises, crunches, "low noise"... I'm starting to enjoy it again. I´m very happy. Lesson learned now that I'm going to start my Dynalo Susi
Pars Posted October 30, 2017 Report Posted October 30, 2017 On 10/27/2017 at 5:10 AM, jose said: LSK489/LSJ689 looks good but I can't find where to buy them... OK, I only find trendsetter but shipping costs are terrible. Speaking of which, I thought that Linear had released an LSJ109? They don't show them on their site, and from what I could find, they claimed they were available, but no one seems to have gotten any? Fast forward to today with the LSJ689... Trendsetter doesn't list them, and apparently the other place referenced doesn't either? Are these going to be the same thing again? They do seem to really have LSJ74s, so at least there is that.
jose Posted October 30, 2017 Report Posted October 30, 2017 What is the problem with LS?I bought a quad of LSk170/lsj74 on DIYAudio a couple of months ago but I still haven't compared them with Toshiba.
spritzer Posted October 30, 2017 Report Posted October 30, 2017 8 hours ago, Pars said: Speaking of which, I thought that Linear had released an LSJ109? They don't show them on their site, and from what I could find, they claimed they were available, but no one seems to have gotten any? Fast forward to today with the LSJ689... Trendsetter doesn't list them, and apparently the other place referenced doesn't either? Are these going to be the same thing again? They do seem to really have LSJ74s, so at least there is that. I got mine from Trendsetter so I don't know what is going on...
gepardcv Posted October 30, 2017 Report Posted October 30, 2017 7 hours ago, jose said: What is the problem with LS? I bought a quad of LSk170/lsj74 on DIYAudio a couple of months ago but I still haven't compared them with Toshiba. I want to know, too. Was thinking of trying this to replace the THAT parts: https://diyaudiostore.com/collections/parts/products/linear-systems-matched-jfet-pairs-grade-b
kevin gilmore Posted October 30, 2017 Report Posted October 30, 2017 that definitely works, but the price is a bit goofy. probably what happens when you spend 10 years trying to make better parts only to make parts identical to the originals 2 1
penmarker Posted October 31, 2017 Report Posted October 31, 2017 8 hours ago, gepardcv said: I want to know, too. Was thinking of trying this to replace the THAT parts: https://diyaudiostore.com/collections/parts/products/linear-systems-matched-jfet-pairs-grade-b Saw that site when I was googling about LSJ74/LSK170. That's mad, $49.99x2 for a balanced board.
Pars Posted October 31, 2017 Report Posted October 31, 2017 Well, yes high. How many would you need to buy to ensure good matches if you were doing it yourself? ~$30 for 8 LSK170s and $62 for 8 LSJ74s. You might get a matched quad out of that, but I had heard that Linear's devices are all over the map regarding Idss within a certain grade.
mwl168 Posted October 31, 2017 Report Posted October 31, 2017 2 hours ago, Pars said: Well, yes high. How many would you need to buy to ensure good matches if you were doing it yourself? ~$30 for 8 LSK170s and $62 for 8 LSJ74s. You might get a matched quad out of that, but I had heard that Linear's devices are all over the map regarding Idss within a certain grade. According to the DIYAUDIOSTORE site, that price comes with 2 matched pairs. 1
penmarker Posted October 31, 2017 Report Posted October 31, 2017 (edited) They might have changed the pricing, now its $60.52 for 8 LSK170 and $69.47 for 8 LSJ74. That there alone costs as much as some mini headphone amps. I might just gamble choosing among ~4 THAT340 instead since we can get it locally/easily from Element14. Anyway, I've purchased a chassis and thinking about doing a single chassis build. I've made a rough layout of what it could look like, appreciate it if others could chime in. 2 images; the first shows only bottom floor layout without the amp boards above it. The second shows all boards including proposed front panel layout. Toroid is in the middle and amp will be powered by single Beta22 mounted on heatsinks in blue. Orange board at the rear right is a balanced relay switcher with a small 12v transformer+BR for power. Amp boards will be attached on the top of the case and fastened to the walls with standard L profile like others. Because of the size of the transformer, the only location it could be is in the middle where there aren't any tall components on the amp board above it. Edited October 31, 2017 by penmarker
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