It sounds like your JFETs are toast, although I don't understand what could have made them both go at once....
Anyone else see anything in this data?
Anyone else see anything in this data?
.....crap. Those are the toughest devices to replace as well. And of course there's none in the store at the moment. Anybody have a spare pair PM me please.
You can usually get them from John LaGrue ("punkydawgs" on Ebay). Genuine parts; well matched.
[Edit: he's selling NOS Toshibas, not the Linear Systems replacement parts. Some say the Toshibas sound better.]
[Edit: he's selling NOS Toshibas, not the Linear Systems replacement parts. Some say the Toshibas sound better.]
Well thanks Jeff but I don't think I want my Left Channel sounding "better" than my right channel 😉 - though I'd probably be hard pressed to notice the difference. More than anything I'd just like the amp to be original even though it's DIY.
Not to dissuade you (and I agree that it would be odd to have 1/2 Linear Systems and 1/2 Toshiba), but just to be clear: the Toshibas are the originals; the Linear Systems parts are (licensed) copies.
But surely someone must have some Linear Systems parts not currently in use...
Cheers,
Jeff.
But surely someone must have some Linear Systems parts not currently in use...
Cheers,
Jeff.
If you haven't already, please try contacting the diyaudio store to see if they can supply
you a pair. As far as I can tell, the LS parts aren't widely distributed (unlike the
Toshibas in their glory days) so the number out in the wild might be limited.
Cheers,
Dennis
you a pair. As far as I can tell, the LS parts aren't widely distributed (unlike the
Toshibas in their glory days) so the number out in the wild might be limited.
Cheers,
Dennis
From the master of odd:
I can only imagine good sir that your collection of half filled boards with parts extracted to fill others is a gold mine worthy of Papa himself. Mine on the other is rather modest and this F5 is quite precious to me. Perhaps down the road after I've attempted a few more builds it might not feel quite that way but at the moment I will take my time. Your input, as always, is still very much appreciated!
I can only imagine good sir that your collection of half filled boards with parts extracted to fill others is a gold mine worthy of Papa himself. Mine on the other is rather modest and this F5 is quite precious to me. Perhaps down the road after I've attempted a few more builds it might not feel quite that way but at the moment I will take my time. Your input, as always, is still very much appreciated!
you'll not hear difference between Toshibas and LS - in F5 , as long they're reasonably matched - between channels , so you're getting reasonably close OLG , thus feedback amount
so , just find them wherever you can and enjoy ........... people are regularly having significant difference between channels due to speakers positioning , and it seems few of them are worried
🙂
so , just find them wherever you can and enjoy ........... people are regularly having significant difference between channels due to speakers positioning , and it seems few of them are worried
🙂
Okay then. Is this a drop in replacement?
Genuine Toshiba 2SK170BL/2SJ74BL high transconductance JFET complimentary pair | eBay
Genuine Toshiba 2SK170BL/2SJ74BL high transconductance JFET complimentary pair | eBay
Normally you'd need more than a little luck with Toshiba JFETs, but toshiba-san does appear to be a known seller around here, so I think you're good:
Replacement For Toshiba 2SK170/2SJ74
Cheers,
Jeff.
Replacement For Toshiba 2SK170/2SJ74
Cheers,
Jeff.
No, I try buying thru E-Bay there and it takes me to a dialogue box to ask me what country and when I put in Canada, it automatically switches back to US. He says he ships to other countries but I can't figure out how to make it Canada. When I try to use the contact seller link it brings me back to the same dialogue box.
See if this works better:
Toshiba 2SJ74 + 2SK170 LAB MATCHED PAIR 0.03mA AND 4mV (7-8ma Idss Range) | eBay
Toshiba 2SJ74 + 2SK170 LAB MATCHED PAIR 0.03mA AND 4mV (7-8ma Idss Range) | eBay