[TenTec] Need help with corsair ii

[nf4r at comcast.net]

Thanks to Phil,Barry,Bob and all others that have been helping with the audio problem on corsair ll. I changed the resistor to 100k,th en 220k .After each change the ALC light flickered 

with less drive,but audio had no change. Recieved card from station that made me aware of problem. In the remarks h e said it also was distorted. What a can of worms. Am going to set it on the shelf for a week then get back to it. Maby the headache will subside.  For now I'll use my paragon and be thankful I have it. Thanks to everyone this has been a good learning experence. 

de nf4r  Dave  Hope this goes to the right place. 

----- Original Message -----


From: "Phil Chambley, Sr." <k4dpk at comcast.net> 
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com> 
Sent: Monday, March 25, 2013 8:43:43 PM 
Subject: Re: [TenTec] Need help with corsair ii 

On 3/25/2013 8:22 PM, nf4r at comcast.net wrote: 
> 
> Looked at schematic for audio processor and u2a only has pin 1-4,however there is a 15k between pin 1 and 2 of u2a. The chip info in  my manual shows a dot to indicate pin 1. 
> 
> 1>    8             > is dot.  Is this the right one? 
> 
> 2      7 
> 
> 3      6 
> 
> 4      5 
> de nf4r 
> 
> 
> ----- Original Message ----- 
> 
> 
> From: "Phil Chambley, Sr." <k4dpk at comcast.net> 
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com> 
> Sent: Monday, March 25, 2013 1:35:58 PM 
> Subject: Re: [TenTec] Need help with corsair ii 
> 
> *I think R68, at 15k ohms, is holding the first mic amp gain down n the 
> Corsair. 
> 
> If I recall correctly, I have in the past changed this resistor to* 
> *around 220k-330k to bring the gain up.  The Paragon has a 470k in that 
> position. 
> In the Corsair, that resistor is between pins 6 and 7 of U2A 
> * 
>> ** 
> *Phil C. Sr. 
> k4dpk* 
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Dave 

I think so.  You can be certain by checking if pin three goes to the mic 
input through a 1 uf capacitor and 106.8k of resistance. 

Ten Tec frequently showed one half of an IC being used when it was in 
fact the other half in the circuit. 

Phil C. Sr. 
k4dpk 
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