[AMRadio] Triode connecting 803's for a Modulator


Mike Dorworth, K4XM k4xm at arczip.com
Sun Apr 9 16:08:14 EDT 2006


No, he had the screen and control grid strapped and fed. The supressor was
biased in the center tap of the driver transformer with the voltage
indicated. Mike
----- Original Message -----
From: "Donald Chester" <k4kyv at hotmail.com>
To: <amradio at mailman.qth.net>
Sent: Sunday, April 09, 2006 3:47 PM
Subject: Re: [AMRadio] Triode connecting 803's for a Modulator


>
>
> >From: "Mike Dorworth, K4XM" <k4xm at arczip.com>
>
> >On page 662 of the 15th Edition of  RADIO HANDBOOK by Editor and
Engineers.
> >Paragraph 30-8 the use of 803 in triode connection is fully discussed. A
> >schematic (figure 20)  shows 2500 volts at 18000 ohm plate to plate being
> >driven by a 8 watt speech amplifier through a Stancor A-4761 Class B
driver
> >transformer set for 2:1 Ratio. Eg-g =170 volts
> >Driving power 7-8 watts
> >Resting current = 50 mA.
> >Power output = 510 watts
> >Supressor volts = 280-340 volts
> >
> >A Chicago CMS-3 was used for the output transformer..
>
>
> I assume all three grids simply strapped together.  Is that correct?
>
> In some circuits with triode-connected tetrodes, particularly the 807, the
> screen grids are driven directly with the audio, and a resistor is placed
> between the screen and control grids.
>
> Don k4kyv
>
>
>
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