And what about 2SJ74? Is there a similar replacement?
Bob Cordell has quite a few paragraphs and schematics of using n-channel JFETs with bipolars to arrive at the same (or better) conclusion. In any event, his book: "Designing Audio Power Amplifiers" deserves a place on your bookshelf.
I have received some curves of "fake" 2SK170/2SJ74 from Watanabetomoaki
that he measured, comparing them to the real thing.
The interesting thing was that they looked a lot like the J113 and J176
parts...
Of course Watanabetomoaki sells the real thing.
J113 and k170 have different pinout
any idea what jfet are chinese 'experts' relabeling as K170?
to frozenpod1 #504
I run a quartett of LinearSystems LSK170 / LSJ74 complementary pairs in one
of my BA-3 poweramps (frontend) at a rail voltage of +- 34.5 volts (with a little extra heatsink - selfmde for TO-92) for 2 years now. With no problems. They run at a temperature around 35-40 C (temperature).
So they seem to be very robust / tough.
Greets
Dirk
I run a quartett of LinearSystems LSK170 / LSJ74 complementary pairs in one
of my BA-3 poweramps (frontend) at a rail voltage of +- 34.5 volts (with a little extra heatsink - selfmde for TO-92) for 2 years now. With no problems. They run at a temperature around 35-40 C (temperature).
So they seem to be very robust / tough.
Greets
Dirk
Precision and conservative ratings?
Precision. In my experience, the part-to-part conformity of the Toshiba
parts has always been excellent.
Precision. In my experience, the part-to-part conformity of the Toshiba
parts has always been excellent.
Yes I agree. I have been using them since 2001.
Hi does anyone have any experience with the breakdown voltage of the linear systems LSJ74B.
Verified as 26V.
What we really need here is that Eff-ing price slasher guy
who'd slash the price of the cars during the "Creature Feature" breaks.
We need the price slasher to help us regular folk so we can buy some of these
devices.
As that's not likely to happen I take solace--drinking to my
Harvey Wallbanger posters as I shudder in fear at the thought that
the "Creature of the Dark Lagoon" may infact have been reel.
Cheers
who'd slash the price of the cars during the "Creature Feature" breaks.
We need the price slasher to help us regular folk so we can buy some of these
devices.
As that's not likely to happen I take solace--drinking to my
Harvey Wallbanger posters as I shudder in fear at the thought that
the "Creature of the Dark Lagoon" may infact have been reel.
Cheers
Many here have already published circuits which, instead of 2SK170/2SJ74, make use of JFETs readily available.
Be it 2SK209, 2SK2145, J113, ..... etc.
True that they are not direct replacements.
And they are not 1:1 comparable in performance.
But anyone can still build very nice sounding amplifiers with a limited budget.
The UDNeSS, for example, uses 4x 2SK209GR and 2x FQA9P25.
The JFET costs less than 40 cents a piece; the MOSFET less than 2 USD each.
There is no reason to complain if you do not want to pay for those unobtaniums.
But of course there are good reasons why they cost what they do.
A matter of supply and demand.
Cheers,
Patrick
Be it 2SK209, 2SK2145, J113, ..... etc.
True that they are not direct replacements.
And they are not 1:1 comparable in performance.
But anyone can still build very nice sounding amplifiers with a limited budget.
The UDNeSS, for example, uses 4x 2SK209GR and 2x FQA9P25.
The JFET costs less than 40 cents a piece; the MOSFET less than 2 USD each.
There is no reason to complain if you do not want to pay for those unobtaniums.
But of course there are good reasons why they cost what they do.
A matter of supply and demand.
Cheers,
Patrick
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