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Replacement For Toshiba 2SK170/2SJ74
Replacement For Toshiba 2SK170/2SJ74
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Old 17th January 2018, 01:55 PM   #11
nigelwright7557 is offline nigelwright7557  United Kingdom
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New designs should be moving over to vertical mosfets.
I certainly cant tell the difference in sound having built loads of each type, vertical and lateral.
Having said that the popular irfp240/9240 are now hard to get.
But there are other options.
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Old 17th January 2018, 02:00 PM   #12
6L6 is offline 6L6  United States
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Replacement For Toshiba 2SK170/2SJ74
Quote:
Originally Posted by nigelwright7557 View Post
Having said that the popular irfp240/9240 are now hard to get.
They can still be found through the big houses easily. That said, everything though-hole is rapidly going away. Which is a bit of a challenge in the long term.
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Old 17th January 2018, 02:06 PM   #13
nigelwright7557 is offline nigelwright7557  United Kingdom
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IRFP240/9240
RS no longer do them.
Farnell were out of stock but I checked again today and they are back in stock.

I have noticed through hole components dwindling slowly.
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Old 17th January 2018, 02:15 PM   #14
indra1 is offline indra1  Indonesia
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Thank you Jim.

However, I found no problem when I tried the GR on an F4, I think experienced builders will find that the A grade can serve well enough for some of the F4, B1R2, M2, F6 and F5 (using Toshiba) builds, off course appropriate resistors have to be adjusted. The C grades are also very usable when cascoded or on lower voltage circuits like the LXmini XO.

Please correct me if I am mistaken.
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Old 17th January 2018, 02:25 PM   #15
6L6 is offline 6L6  United States
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Replacement For Toshiba 2SK170/2SJ74
Indra1 -

I agree completely. Where the issue starts is when a novice builder can't find the parts that will just work without any tweaking or subtle changes.

The LXmini XO will most likely be made with different parts... but again, you are correct in saying the C (V in Toshiba) would work well.

Niglel -

Are you searching for the straight 240 or the 240PBF? The lead-free is the only one I know that is still in production.
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Old 17th January 2018, 02:30 PM   #16
AndrewT is offline AndrewT  Scotland
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Farnell, Rapid, mouser and digikey all have stock of irfp240
RS has the irfp9240 in stock.

I wonder if you have been searching for irf240?
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Old 17th January 2018, 02:38 PM   #17
indra1 is offline indra1  Indonesia
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Originally Posted by 6L6 View Post
... The LXmini XO will most likely be made with different parts... ...
Thank you. What a relief to know.
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Old 17th January 2018, 02:42 PM   #18
6L6 is offline 6L6  United States
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Replacement For Toshiba 2SK170/2SJ74
I agree. Seeing the LXmini+sub crossover with what appeared to be eighteen (18!) pair of K170/J74 during the BAF17 presentation gave me a momentary heart attack.

Luckily there's a different solution that works very well.
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Old 17th January 2018, 03:39 PM   #19
Zen Mod is online now Zen Mod  Serbia
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Replacement For Toshiba 2SK170/2SJ74
still much better than seeing 18 pcs of OP chips

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Old 17th January 2018, 05:32 PM   #20
Nelson Pass is offline Nelson Pass  United States
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Replacement For Toshiba 2SK170/2SJ74
At the moment, apart from Linear Systems offerings in the DIYaudio store,
this is the most reliable offering I know, a known manufacturer of
our acquaintance who bought tons of these new before they were
discontinued and who does a fussy job of matching them.

Seller:

punkydawgs on eBay

Listings:

Toshiba 2SK170 FOUR MATCHED PAIRS (4 pairs) to 0.03mA / 4mV in Temp Control Lab | eBay

Toshiba 2SJ74 + 2SK170 MATCHED PAIR 0.03mA AND 4mV 6.5mA-7.9mA Idss Range | eBay

Toshiba 2SJ74 + 2SK170 MATCHED QUAD to 0.03mA AND 4mV 10.3mA-10.7mA Idss Range | eBay

Toshiba 2SJ74 + 2SK170 MATCHED QUAD to 0.03mA AND 4mV 7.2mA-7.4mA Idss Range | eBay

Last edited by Nelson Pass; 17th January 2018 at 05:35 PM.
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