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Old 13th February 2014, 12:44 AM   #21
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Sony 2SJ18 is not rank from 53 to 58 after document
i have doubt is genuine one
Some rank first or last unknow batch ?
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Old 13th February 2014, 01:14 AM   #22
Junm is offline Junm  Philippines
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I have sources of 2sk60 jF-34 2sJ18 JG-24 they are originals and the sellers says he has still around 50 pairs comes from a japanese supplier before....
My question is are they really match pair?

As per DiyAudio member, the rank number is only the last digit and the other including sub letters are batch number etc... In this case the rank is 4.

Looking at the attached datasheet...they are rank from 2 to 8 if i'm not mistaken.
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Last edited by Junm; 13th February 2014 at 01:40 AM.
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Old 13th February 2014, 01:41 AM   #23
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Interesting question let's see transistors inside of Vfet Sony
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Old 13th February 2014, 01:57 AM   #24
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[QUOTE=Junm;3817560As per DiyAudio member, the rank number is only the
last digit and the other including sub letters are batch number etc... In this
case the rank is 4. Looking at the attached datasheet...they are rank from 2
to 8 if i'm not mistaken.[/QUOTE]

Acronman has been referring to the letter of the rank designation in their
offerings, for example I have been purchasing "E" designations.

This does give rise to some confusion which I think will be resolved shortly.

On the other hand, I am simply testing each part, and so should you. I heat
sink them and run them at 20 Vds and determine which Vgs value gives me
0.5 and 1.0 amp Ids.

So far for parallel operation I have been using values within 0.1 Vgs, and
they behave gracefully. Probably you could expand that tolerance to 0.2 V
or even higher without problems.

The only parallel case so far has been the big Sony VFET commemoratives,
the other examples being just single pairs of P and N which do not require
Vgs matching.

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Old 13th February 2014, 02:56 AM   #25
Junm is offline Junm  Philippines
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Thanks Mr. Pass for the tips...maybe it will be better to match them actually...i plan to parallel these sits...Can you share us schema on how to test and match these things?
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Old 13th February 2014, 05:06 AM   #26
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Lightbulb Hi all!

My Res-Sit have been playing beatifully through my new Alpair12P - for a couple years now.
But I got one extra(spare) pair of 2SK82 from Acronman - just in case. If someone is interrested - I can put them on EBay? Have moved to Dac-building and other projects!

It is same rank as the original that Michael used in the original LĀmp (I`m stucked in the storm in the NorthSea - so can`t check for the moment)

Or is there someone around the westcoast of Norway - give a sign.

Best

Olav
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Old 13th February 2014, 07:41 PM   #27
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Hi OlavHaal

This Sony 2SK82 be come rare and its very probably we see preamplifier diy project with them or others and is useful to have spare parts for the future.
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Old 13th February 2014, 08:17 PM   #28
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toobz are good for preamps , too

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Old 13th February 2014, 08:24 PM   #29
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Quote:
Originally Posted by WalterW View Post
This website seems to have them at a reasonably price:
It's sad but I don't trust any semiconductor device purchased out of China - a few rotten apples have tainted the whole barrel. Nothing against China or against buying other products from China where I can see clearly what I am getting. Recently I bought some chasis from China and they are just fine.
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Old 13th February 2014, 08:30 PM   #30
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Quote:
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toobz are good for preamps , too

He's right. Save your SITs for amplifiers. There will be more designs to come I'm sure. Using them in a preamp is something only a mentally deranged guy like me would do.
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