I think that was the APRIL issue of Tube Collector magazine. The heck of it is, he used a galena crystal as a modulation transformer!
On 16 Feb 2006 at 20:42, John Coleman ARS WA5BXO wrote: > OK BOB! > You got my attention. Explain more. I hope I'm not a sucker > here. I have seen and extremely low mu amplifier circuit (common > cathode) made by reverse biasing the plate of a triode and forward > biasing the grid where output is taken from the grid and input is on the > plate. So I know that weird stuff does exist. > > John, WA5BXO > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Bob Deuel > Sent: Thursday, February 16, 2006 6:05 PM > To: 'Discussion of AM Radio' > Subject: [AMRadio] Re: AM Transmitter Advice?? > > Hello Larry and all: > > Larry's tongue in cheek comment employing 866's as a linear amplifier > tube > prompted me to contribute the following: Certain full-wave rectifiers > can be > configured to amplify or oscillate. I have built audio, Hartley and > Simpson > oscillators using only 6AX5GT's full-wave rectifiers as the sole active > device. These were displayed at 2004 Mid-Atlantic Antique Radio Club > Meet > and actually won a Blue Ribbon. > Late last year I built an AM transmitter consisting of a Hartley > oscillator > modulated by an AM modulator using only 6AX5GT full-wave rectifier tubes > as > the active devices. No solid-state magic, just simple full-wave > rectifiers. > The basic concept is that of the Heintz and Kaufman gridless Gammatron > circuits. The transmitter was set up for the broadcast band and works > fine. > It has been publicly demonstrated a couple times now and a write up > including the circuit was published in the February, 2006 issue of the > "Tube > Collector" magazine which is the bi-monthly magazine published by the > Tube > Collectors Association, Inc. It is fun to make full-wave rectifiers do > more > than just rectify. > > Bob, K2GLO > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of ne1s > Sent: Thursday, February 16, 2006 10:36 AM > To: Discussion of AM Radio > Subject: [AMRadio] Re: AM Transmitter Advice?? > > Donald Chester writes: > > > > >> Assuming one is going to build a linear, and so putting aside other > >> issues > >> such as linear vs plate modulation, why do you think it makes a > >> difference > >> what tube is used? Are you referring to running a linear at greater > than > >> legal limit?. > > > > Well, go ahead and try building a legal limit linear that runs a pair > of > > 807's in the final. > > > > Yeah, or a pair of 866As.... > > Sorry (the devil made me do it). > > 73, > -Larry/NE1S > ______________________________________________________________ > 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 > > ______________________________________________________________ > 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 > > > > ______________________________________________________________ > 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 >
