[TenTec] Argonaut 509 sidetone "pop" fixed

[g p]

A fellow ham dropped me an email with a fix for the keying "pop" which I must say I had my doubts till I actually tried it and worked, very simple fix and below is a portion of his email on the fix, just thought I pass it on to others.
 
>>>If your keying issue is related to your keyer not taking the signal close enough to ground (like a straight key closure) you can try biasing the keying circuit just by putting a 1.5v AA battery in series with the key line.  I had to do this when I interfaced to my Kenwood TS-440 keying circuit from my MFJ-1279 sound card interface.  The photo-optic isolator just would not consistently key the rig.  I found the tip online somewhere and it worked great.<<<
 
>>>It would be easy to test - I am not sure of the polarity but there are only 2 ways to try ;-)  The battery will last a long, long time.  If, after testing it and it works, you can buy a 1 cell holder at Radio Shack so that you can easily replace the battery every 3 years or so.<<<
 
Im curious to see what others think about this.
 
Gil