Sorry about the spelling! You may want to join in the mail group called AMPS CONTESTING lots of really smart guys their on linear amps.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Coleman ARS WA5BXO Sent: Wednesday, August 03, 2005 9:09 AM To: 'Discussion of AM Radio' Subject: RE: [AMRadio] info wanted on 4-400 linear amplifier Grid driven linear amps are a challenge sometimes even tetrode tubes need to be neutralized. Neutralization not only prevents spurious oscillations but it also stops phase modulation products. Swamping the grid circuit with a dummy load is a good idea because it reduces the 90 degree feedback that we are trying to neutralize and makes the driver radio a lot happier with a more constant load. The nice thing about grid driven is it would be easy later on to plate modulate and run it class C. As for linear amps I thing GG is a better solution especially with triode tubes made for the purpose. You may want to join in the mail group called AMPS CONSTESTING lots of really smart guys their on linear amps. John WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, August 02, 2005 8:10 PM To: [email protected] Subject: [AMRadio] info wanted on 4-400 linear amplifier I am planning to build a linear amp around a grid driven 4-400 tube. Can anyone suggest where I can find a suitable circuit with component values. I would like band-switching for 80, 40 and 20 meters. I will be driving it with a 25 watt carrier output rice box on AM. I don't like the one in the ARRL 1967 handbook because it requires you to open the lid and physically change taps on the coil and change tuning capacitors. I don't have any other older handbooks. Thank you. Ed K6UUZ ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
