Roy,
I think one of the reasons for the change from the MC1350 to the NE612
followed by the LM386 was due to the fact that when the K1 was designed,
the MC1350 in its DIP format was "not to be used for current designs".
Yes, the MC1350 is still available in SMD format, and Elecraft has
designed a carrier board that allows its use in the DIP format holes
(for the K2 ongoing support).
To redesign the the K1 to use the MC1350 would be challenging. The AGC
system would have to be changed to use that part. There is nothing
wrong with the "dual NE612" designs - there are several out there, and
they perform quite nicely.
BTW - the K2 used the LM380-8 audio amplifier, not the LM386.
73,
Don W3FPR
On 10/17/2014 9:50 PM, r j wrote:
Well ... Thanks for the history. One can also look at Elecraft's website
http://www.elecraft.com/about_elecraft.htm
But my question remains: Why did the (very early) Sierra and the (first
Elecraft product) K2 have IF amp (MC1350 - and of course the standard AF
amp LM386), but the K1 was equipped with no IF amp but two AF amps (LM386
and LM380) and an accordingly somewhat problematic AF based AGC.
Thanks.
Roy
RF Tinkerer
On Sat, Oct 18, 2014 at 8:34 AM, Eric Swartz - WA6HHQ, Elecraft <
[email protected]> wrote:
More history - Elecraft was formally created July of 1998. (We began
working on the K2 design well before that.)
We shipped the first 100 K2 Field Test Units January and Feb. of 1999. We
took orders for production K2 kits at Dayton in May of 1999.
We followed that with the K1, then the KX1, the K3, and most recently the
KX3.
73,
Eric
elecraft.com
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