[Elecraft] TF3MA sidetone mod for K2

[Bill W4ZV]

Don Wilhelm wrote
> 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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Are you sure about that Don?  Others with S/N above 3000 have noted the
difference I did in #4119.  Here's a thread from 2008, well past my 2004
vintage unit.

http://elecraft.365791.n2.nabble.com/sidetone-mod-now-works-td395423.html

73,  Bill  W4ZV



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