Thanks guys. The reason I asked is, it seems there is a lot of discussion in the thread about these devices being used as substitutes, yet I've scoured the docs and was unable to find a picture showing the correct orientation using this new board.
BTW, are there other dual JFETs available today to use as replacements for the Toshibas - without being very pricey NOS? I understand the duals are 'unobtanium'. I thought the board was specifically designed for these 3-pin devices, as well as, the 7-pin duals? Seems many other members are using them as well.
BTW, are there other dual JFETs available today to use as replacements for the Toshibas - without being very pricey NOS? I understand the duals are 'unobtanium'. I thought the board was specifically designed for these 3-pin devices, as well as, the 7-pin duals? Seems many other members are using them as well.
As I wrote before..... Very well matched 2SK170 in the Idss range 7-8 mA, and you´ll be in no trouble 🙂
The 2SJ109BL/2SK389BL package will work better with the heatsink design (which also encapsulates the Zetex BJTs) as the package is flatter than the TO92 package of the singles. That said, I wouldn't worry about using singles. Also, the 2SJ74/2SK170 singles could be put in inline as according to John Curl, they work just fine backwards. Just compare the datasheet pinouts of the dual 109/389 to the 74/170s and you can see how to put them in if you want them the correct way.
Linear Systems does make duals, but not in a comparable or workable package, so if you use Linear Systems version, the singles are the only way to go. Their B variant matches up to the recommended Toshiba BL variant.
Linear Systems does make duals, but not in a comparable or workable package, so if you use Linear Systems version, the singles are the only way to go. Their B variant matches up to the recommended Toshiba BL variant.
Also, a guy here on diyaudio does have genuine Toshiba 2SJ109BL/2SK389BLs for sale. They are expensive, but so is this preamp.
Yes it is. I'm finding that out. 🙂 I'll be using ones from the DIYStore. Good to know I can install them either way. Think I'll stick to proper orientation.
That was true for the Toshiba singles. I don't know that is a fact for the Linear Systems devices so proper way would be best for those.
Try this one:
Universal Parcel Tracking - Global Package Tracking
Looks, as if it left Taiwan on july 28.... "Only" 24 days in transit 🙂
Consider yourself lucky. We in Denmark are oviously still banned, with no relay-resolution as of yet 🙂
It´s also registred at PostNord, so everything should be fine eventually 🙂
Universal Parcel Tracking - Global Package Tracking
Looks, as if it left Taiwan on july 28.... "Only" 24 days in transit 🙂
Consider yourself lucky. We in Denmark are oviously still banned, with no relay-resolution as of yet 🙂
It´s also registred at PostNord, so everything should be fine eventually 🙂
I have lost parcels in transit before, and when nothing happens for this long, my worries increases.
I know.... And I feel for you, but not unusual in these pandemic times.
Only exception I´ve had, was the other day. I bought some LP´s on Discogs from a seller in Berlin. On the 3. day package was delivered 🙂
Only exception I´ve had, was the other day. I bought some LP´s on Discogs from a seller in Berlin. On the 3. day package was delivered 🙂
Thanks for 17track, they have more info than Taiwan Post and Postnord. At least the package whereabout is known and located, which is basically what I wanted 🙂 - I don't mind waiting as long as I know how things are going. So enough of that, it arrives when it does.
Why do I know ?? 🙄
Emty pcb's do nothing ......It is a long way to get a working pre-amp in a nice enclosure. But, your renders looks nice, I will wait to see your end result 😉
Ofc its a long journey, especially since its a side project. I am studying and saving money so I can get my motorcycle license and buy a bike as well. A "project" I've been waiting for much much longer than building my own audio gear 🙂