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To Toshiba or to Fairchild?
To Toshiba or to Fairchild?
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Old 30th September 2017, 03:44 PM   #1
dewdrop is offline dewdrop  Singapore
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Default To Toshiba or to Fairchild?

I did try to search the forum for answers but couldn't find one.

I am building the F5T amp, and collecting the parts.

2 questions, should I invest in:
1. the NOS Toshiba 2SK170-BL/2SJ74-BL or the LINEAR SYSTEMS MATCHED LSJ74/LSK170 JFET PAIRS (GRADE B)?

2. The Toshiba 2SJ201-Y / 2SK1530-Y Grade A N/P Matched Octa or just go for the Fairchilds IRFP240/IRFP9240?

TIA!
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Old 30th September 2017, 05:26 PM   #2
ColinA123 is offline ColinA123  United Kingdom
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If you can buy from a reputable source, (like Spencer.)
Then use Toshiba.
If you are unsure of the source or the grade, for simplicity use LS from the store.

With such a low part count and most of the money in the transformer and case
it seems silly to me to scrimp on Jfet quality.
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Old 30th September 2017, 05:36 PM   #3
EUVL is offline EUVL  Europe
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Toshiba.

You can read Erno Borbely's comments here :
https://linearaudio.nl/sites/lineara...nalsMMM508.pdf

NicMac, Spencer or liubincalvin should have them.


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Old 30th September 2017, 05:59 PM   #4
Nelson Pass is offline Nelson Pass  United States
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To Toshiba or to Fairchild?
That's a great article, and deserves to be re-read.

I would like to think of Erno as an older version of moi.

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Old 30th September 2017, 07:01 PM   #5
EUVL is offline EUVL  Europe
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When I started DIY 15 years ago, Erno's articles on FETs were the first ones I read.
Still a must-read today.

Erno BorbelyJFETs the New Frontier Part 1and 2 | Field Effect Transistor | Amplifier
Items tagged with: N-channel JFET | audioXpress


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Old 1st October 2017, 06:20 PM   #6
Zen Mod is offline Zen Mod  Serbia
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To Toshiba or to Fairchild?
April 2015 :

Erno Borbely site , zip file – for benefit of DIY community | Zen Mod Blog
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Old 1st October 2017, 10:25 PM   #7
mpmarino is offline mpmarino  United States
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Quote:
Originally Posted by Zen Mod View Post
April 2015 :
Very nice. TYVM ZM
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Old 1st October 2017, 11:57 PM   #8
dewdrop is offline dewdrop  Singapore
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Lovely guys. Thanks for all the advice. I know what to do now. ;-)
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Old 2nd October 2017, 12:16 AM   #9
HI-FI PRO is offline HI-FI PRO  China
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I'd say this has to depend on personal taste. If you are bulding quite a few amps using mosfets, then buy both back have a direct compasrison, see which one you like and contine to chose them for new projects.
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Old 2nd October 2017, 12:42 AM   #10
jackinnj is offline jackinnj  United States
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To Toshiba or to Fairchild?
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I would like to think of Erno as an older version of moi.

Less hair, methinks
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