[R-390] Orange Drop vs ceramic disc

[Curt Nixon]

Ben Loper wrote:
> I may try something this weekend.  I have an HP audio osscilator and a two
> trace scope, so maybe just start feeding a signal through a cap and watch on
> the scope.  I don't remember the top end but I think 20 khz for the audio
> oscillator.  I can listen also but my ears crap out at about 10 khz last
> time I checked..
>
> On Fri, Apr 1, 2011 at 9:36 AM, Barry <n4buq at knology.net> wrote:
>
>   
>>  On Fri 01/04/11  9:05 AM , rbethman rbethman at comcast.net sent:
>>     
>>> The difference in performance between the two R-390A/URRs that you did
>>> have so many variables that it is impossible to say why.  Could be the
>>> difference in alignment, methodology of restoration, or different
>>> manufacturer of the actual radio.
>>>
>>> You have been using HP equipment lately.  What did you use before that?
>>>       
>> At that time, I was using an HP410B, a General Radio GR1001A with a Fluke
>> 1920 counter .  The 1001A was replaced with an HP606A and now an HP8640B.  I
>> still have an HP410B and an HP410C.
>>
>> Barry - N4BUQ
>>
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>>     
>
>
>
>   
You will be hard pressed to see any distortion that way..especially at 
the levels we talked about here.  Like 10%...

You wont expect it to flat top and there wont be any crossover 
distortion..it can look very sinusoidal and still have quite high 
distortion levels.

Curt
ex Factory Certified McIntosh audio service tech.