The symetrix is a pro audio processor. 200 ohms source impedance and is easily 
capable of over driving any transceiver. 

Sent from my iPad

> On Feb 2, 2019, at 2:26 PM, Don Wilhelm <[email protected]> wrote:
> 
> Mike,
> 
> Notice that U2 also has an output that is involved in PTT and VOX detection 
> via U4 and the COMP OUT signal.
> The signal at the output side of C31 is driving an impedance of about 8k 
> ohms.  I don't know what your Symetrix mic amplifier is capable of driving.
> 
> 73,
> Don W3FPR
> 
>> On 2/2/2019 1:55 PM, mustang65 wrote:
>> Don,
>> Thanks for the suggestions.
>> I am thinking of putting the outputsignal from the symetrix 528e microphone
>> amplifier
>>  to c20 on the ksb2 board so I will bypass U3 and let the signal go direct
>> to u5 NE602
>> and that way found out if u2 is bad.
>> I will come back with the result.
>> 73 Mike sm3xgm
>> --
>> Sent from: http://elecraft.365791.n2.nabble.com/
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