[ETO_Alpha] 77SX

[Mac McCullough]

Randy: we should talk more on this, I think at one point I had this effect 
as well, however it has gone away recently, I attributed to the fact that 
you had rebuilt my SO/781 and how well it was working , that as a 
coincidental benefit of your work , that the SX was liking it's input signal 
better or as you had mentioned it all needed aligning, that along the way my 
driver  so/781became improved, and since it's return all has been well with 
reports. but of course I now just leave the SO on all the time..  [ mac 
humor ]     but thanx for the much more technical aspect of an answer.. 
mac/mc



Located 46 miles due North of the Alamo, and 121 miles due South of the 
Western White House.   see my website at  www.collinsandharrisradios.com
----- Original Message ----- 
From: "Randy Starace" <randy at kk7tv.com>
To: <ETO_Alpha at mailman.qth.net>
Sent: Friday, November 26, 2004 8:18 AM
Subject: [ETO_Alpha] 77SX


HI Guys,  I have both the 87 and the 77SX and the only mod I have in the SX 
is raising the starting bias.   I have noticed that as the first syllable 
drives the auto bias circuit,  the amp goes through a class change.  The 
result is a raspy effect until the bias raises into the AB1 region.  My bias 
control PCB was the older one with a fixed resistor in place of a variable 
pot.  I changed it back to the pot.  I increased the bias just enough for a 
far field monitoring station to say that the phenomenon was gone.   BTW  hi 
Mac.
Randy Starace
http://www.kk7tv.com
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