In article , starman wrote:
Paul_Morphy wrote:

"N3KCT" wrote in message
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Do you think the NTE-312 would perform the same as the 2SK152?

The NTE-312 is the cross for 2SK152. They should be
electrically identical, and should perform as such.

Well, not exactly. It's the closest match NTE has to the 2SK152, and
"should" function in most circuits. That isn't to say it is an exact
replacement. The NTE device may have a higher noise figure, for example,
which could be obvious on the higher bands. This company in Ireland claims
to be selling the 2SK152 for 62 US cents apiece:
http://www.donberg.ie/descript/2/2sk152.htm

NTE doesn't make anything, they just buy parts that are normally
not available in the US or at end of life, and then mark them up
by a factor of eight or so and sell them to the repair market.
They are a way for an independent electronics dealer (not that
there are many of those still around) to stock semiconductors
from the distribtution channel.

The J310 FET is pretty good, and available from Kits & Parts, and either
Mouser or DigiKey; I can't remember who I got mine from. The price is right
and it might be worth buying several and swapping them in for best
performance.

"PM"

Why is the 2SK152 so rare?

It is/was a proprietary Sony part. The datasheet says it was
designed for read amplifers in VCRs, so maybe there's some out
there that can obtained from scrap Betamax's.

(I've got the datasheet on my FTP directory at
ftp://ftp.eskimo.com/u/m/mzenier/Sony2sk152.pdf).

Mark Zenier Washington State resident