Hi!
As part of the class E kit project, I have developed a self-contained
microphone preamp / equalizer / peak limiter (compressor).
The circuit is designed around an Analog Devices SSM2166P. The circuit is
designed to accept the output of a low impedance microphone, such as a
Radio Shack electret condenser element, and provide a high fidelity,
transmitter-ready output.
While this circuit was designed as part of the class E kit project, it is a
stand-alone unit, which can be used with any transmitter which will accept
between a .5V p-p and a 1V p-p (line level) signal.
The circuit and desciption is available at:
http://www.netway.com/~stevec/ham/ssm2166_compressor.gif
Please let me know if you have any questions or comments :-)
Regards,
Steve WA1QIX
At 08:12 PM 7/31/2002 -0700, you wrote:
Mahlon,
I don't know the whole story, but I do know that my GSB-100 also had a
12AT7 in place of the 12AV7 when I acquired it. I can guess that it was
a popular substitution because (1) the AT7 is a helluva lot more common
than the AV7, and (2) it worked. I tried a 12AV7 in mine (I had exactly
one in a junk box of hundreds, maybe thousands, of tubes) and there was
no noticible difference in the XTAL osc. output.
Enjoy the GSB-100 on SSB, and even AM, but there are much better choices
of transmitters available for the latter.
73,
-Larry/NE1S
Mahlon Haunschild wrote:
>
> Hello, list. This question isn't exactly AM-related, but the equipment
> in question is in the same vintage so I guess it's OK (besides, I do
> plan on at least TRYING AM on it eventually) anyway, here goes:
>
> Just acquired a Gonset GSB-100 transmitter over the weekend, and
> everything appears to be in order with it except for the crystal
> oscillator tube (V10). The book lists a 12AT7 in this location, but the
> book's schematic and the transmitter itself show a 12AV7 instead. WHich
> is correct? These two tubes aren't nearly the same, but on the other
> hand the transmitter works, so should I just not worry and be happy?
>
> --
> regards,
>
> Mahlon - K4OQ
>
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