All,
While Bill's comments are useful, I can say that the TF3MA sidetone mod
is designed for the Rev A K2s (below SN 3000). Those K2s SN 3000 and
above have improvements in the sidetone waveform shaping. If you have
upgraded your K2 below SN 3000 with the A to B kit, then you have the
same sidetone wave shaping as the newer K2s.
I am not familiar with the TF3MA LP audio cutoff nor the JG1XLZ KSB2
audio quality mod, and cannot comment.
73,
Don W3FPR
On 1/6/2019 8:20 AM, Bill W4ZV wrote:
Here are a few audio mods that I've made to my K2:
1. TF3MA's sidetone mod. This cleans up the sidetone to a more pure
sinusoid, allowing better zero-beating by ear. Without it, I found it easy
to zero beat on a spurious product. The improvement also does not fatigue
my ears as much as before during extended operating. This one is definitely
worth doing in my opinion.
2. TF3MA's LF audio cutoff mod.
3. JG1XLZ's KSB2 audio quality mod. (not needed for CW).
I don't have time to find links for these but you should be able to find
them in a keyword search. They are all free and simple to install once you
have the parts.
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