That's amazing. Can't argue with success. And the 7.5W-300V-16K p-p adds up. The published 12AX7 plate dissipation spec must be overly conservative, and the cathode must be pretty efficient.
I always thought of the12AX7 as an audio preamp tube. Bacon, WA3WDR ----- Original Message ----- From: "Mike Dorworth,K4XM" <[EMAIL PROTECTED]> To: "Discussion of AM Radio" <[email protected]> Sent: Sunday, October 02, 2005 5:20 PM Subject: [AMRadio] Minature Mobile Transmitter > >From QST, September, 1952 Class B modulator. The 12AX7 modulator tube > delivers approximately 6 watts output. > > >From QST, November, 1951 A Deluxe Mobile Transmitter for 14 and 28 Mc. Two > 12AX7s- each tube having similar elements in parallel- operate at zero-bias > in Class B modulator circuit which delivers approximately 15 watts output. > (300 volts) > > ARRL Mobile Manual 1st edition, page 178, The modulator employs a type 12AX7 > tube and delivers approximately 7 watts output. > 280 volts resting 10 ma, peak 30 ma. > > QST, December 1956 . 10-12 watts input 50 mc mobile transmitter designed to > operate on the most INEXPENSIVE power supply readily available (for mobile) > . The modulator tube is a type 12AX7.....the modulator plate current should > jump 20 to 25 ma above the no-signal value of 6 ma. > > >From ARRL Handbook, 1960, 37th edition, page V17, 12AX7, 300 volts, 0 > volts grid bias load resistance 16 k ohms output power 7.5 watts. > > __________________________________________________ ____________ > 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 >
