[Elecraft] latest K2 serial #?

[Sverre Holm (LA3ZA)]

The TF3MA sidetone mod is still current as it is in fact a modification of
the B level board, not just the A level board, as the site states that this
is an improvement of exactly the 47k / 82 mH A to B improvement mentioned in
the quote below. See
http://www.raunvis.hi.is/~matti/TF3MA/sidetone_tf3ma.html

See also my mod list here:
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html
(search for sidetone), where I specify it as : "Even more sinusoidal tone
than the mod in serial #3000+ gives"



Don Wilhelm-4 wrote
> Yes, those two mods are old, and apply only to the A level boards (below 
> SN 3000).
> There have been improvements in the K2 sidetone incorporated into the B 
> level boards, and are also included with the A to B mod kit.
> The changes added a 47k resistor in series with C24 (R11 for the B level 
> boards) and a shielded 82mH inductor across pins 7 and 10 of RP5.





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Sverre, LA3ZA

K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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