[AMPS] G2DAF

[Rich Measures]

>
>Rich says:
>
>>However, in a typical 2-tone test, the frequencies are c. 1000Hz apart, 
>>which essentially eliminates the time constant of the screen supply 
>>filter as a factor.
>
>In all probability. 
>
>But put in something modulated at syllabic rate and that's another matter.
>Tom Rauch, W8JI, is a strong advocate of 3 tone testing to pick this sort of
>thing up.
>
Three-tone is good for testing distortion in conventional amplifiers, 
however, if the screen voltage remains constant during the three-tone 
test in a G2DAF amp. (which seems likely) it would not pick this sort of 
thing up.  The best test is probably ordinary speech since it produces 
wide changes in the screen potential in the G2DAF circuit.  .  

-  later, Peter


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm