I found this note from a couple of years ago in my ten-tec folder....
it may be helpful...
73,
dale, kg5u
> -----Original Message-----
> From: TROY WIDEMAN [mailto:tlwideman@eee.org]
> Sent: Wednesday, October 15, 1997 3:46 PM
> To: tentec@contesting.com; n9thc@foxvalley.net
> Subject: [TenTec] T-T's Mod for the mike preamp
>
>
> I installed the mod reported by Rick, N9THC, in the mike
> preamp on my Omni VI. It was very similar to one I had
> already devised but I decided to install a more "official"
> change. The mod (change R55 from a 330k to a 470k and R54
> from a 47k to a 22k) does increase the gain needed by the
> Heil cartridges. The approach I used was to just shunt R54
> with a 39k and insert a 139k in series with R55. An
> additional mod I added was to shunt C50 (.1 ufd) with a
> 10ufd capacitor. My voice is quite low and, by doing this,
> the preamp accommodates my voice characteristics.
> 73, Troy, W6HV
>
>
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