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" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, April 09, 2006 3:47 PM Subject: Re: [AMRadio] Triode connecting 803's for a Modulator
> > > >From: "Mike Dorworth, K4XM" <[EMAIL PROTECTED]> > > >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 > > > > _______________________________________________________________ > > This message was typed using the DVORAK keyboard layout. Try it - you'll > like it. > http://www.mwbrooks.com/dvorak/ > http://gigliwood.com/abcd/ > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb >
