I made a folder in Photos just now and uploaded the schematics
for ALA1530LN, ALA100LN, FLG100LN that I've traced out in the
past. There should be complete info there for anyone to be able to
make their own. The original leaded 2SK715 jfets are now
unobtainable, but there are two SMD equivalents that work just as
well, with the 2SK932 preferred since its typical yfs is the same
as the 2SK715. One should be able to make one of these for around
$50--maybe less. On eBay I see a Chinese seller claims to be
selling an ALA1530LN or an ALA100LN for a very high price of
around $250, for the loop amp alone! I have no idea if it's a
direct clone of the Wellbrook.
/g/loopantennas/album?id=296460.??? The name of
the folder is "Wellbrook official traced-out schematics ALA1530LN,
ALA100LN, FLG100LN".
73,
Steve AA7U
On 7/17/2024 2:15 PM, Paul V Birke via
groups.io wrote:
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Dear Martin
I thought Steve Ratzlaff
did some "unpotting" amongst others
Maybe we need to find out
what they found.
I remember seeing results
from at least two "unpottings"
best wishes
Paul
