[MRCA] ARC-2 audio performance

[WF2U]

Jeep,

I have 2 of these, one is operating, I haven't tried the other because it's full of fine sand inside in the gears, so I gave to get rid of that sand/grease gook. It came from one of the desert aircraft graveyards.
My operating one, with the original dynamotor puts out just a tad under 40 W. Haven't looked at the modulation as I always used it on CW, just monitored the audio on another receiver. I use the Navy RS-38 mike with it. 
What I can do is - when I have time - to get on the local 75 m AM net and ask someone to look at the modulation. If I get about the same as you, it is definitely by design...

73, Meir WF2U
SC

⁣Sent from BlueMail ​

On Nov 25, 2017, 1:42 PM, at 1:42 PM, DSP3 <jeepp at comcast.net> wrote:
>I have a working RT-91 on the air, sort of.  I'm getting out about 30 
>watts via a Heath HP-23A tamed a bit with a Variac.  The modulation 
>looks OK but is measured to at 60-75% with a very good carbon mic.  My 
>question is, if I dummy the 12H6 audio limiter filament and pull the 
>tube, looks like I can get a bit more modulation, being careful not to 
>overdrive. Anyone with some experience here?  The book says its 
>impossible to over-modulate, via the limiter.  They are right.....
>
>Jeep - K3HVG
>
>
>
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