Hi Dimitris, MF, Do you confirm my observation? : Very often is see this dependency: The more effort and time someone spends to build a PA or similar circuit to make it look as perfect as possible, t
LF The webpage was a bit tricky, here is a direct link to the full size picture of the TX: http://www.cchidgey.pwp.blueyonder.co.uk/images/500KHz%20Transmitter_01.jpg BR Paul-Henrik, OH1LSQ
By the way, here is my current 40 m 807 transmitter.This was the first attempt at building a valve TX. people.physics.anu.edu.au/~dxt103/valves/807/ I will use the same type of chassis for the 472 kc
Hi Stefan, I am also not part of the tube generation (born in the seventies) but I am fascinated by them! While a class-E PA is a very sensible and efficient PA, tubes (or valves) have a different ki
Well, yes. There are builders and there are users I think. If you enjoy building, you spend most of your time doing that.If you enjoy operating, you do only the minimum necessary building. The valve
Hi Pete Stabilise both Plate es Screen on an Oscillator, followed by a Cathode follower to avoid chirp and osc pulling. The T1154 was very unstable with a bad chirp, surprised it ever passed Quality
Well, I guess it's not the kill but the thrill of the chase... OR as we say in swedish: "Det är inte målet utan resan dit..." - "It's not the destination but the trip to it..." BR - keep the solder f
lol well that config is for linear service , you should have the screen fed via something like 6.8K from the plate supply , with a 0.1 uF decoupling cap , no regulation for class C as the screen volt
Now there is a idea , could use a music synth to make a wobbly note , and send it via the ssb exciter , for a real retro vintage cw sound ? just had a long retro data qso with Chris xiz , on 502 , mu
Why the stabilised screen supply ? G.. By the way, here is my current 40 m 807 transmitter.This was the first attempt at building a valve TX. people.physics.anu.edu.au/~dxt103/valves/807/ I will use
Hi Dimitris, Tubes for PAs is not my world (generation) but the topic is most interesting and the webpage too. Good luck and i hope to see some traces from you some time, at constructive QSB :-) 73,
Probably a early form of Spread Spectrum , hard to JAM if is its jumping about the band and difficult to make a fake transmission if the Tx has a wobbly bob signature : ) G.. From: M0FMT Sent: Wedne
Hi Paul-Henrik, thanks for the direct link. I am curious to see the pi-tank design. Once I have decided the power output (will be based on the HV transformer I decide to use), I will calculate the ma
Hi Pete Stabilise both Plate es Screen on an Oscillator, followed by a Cathode follower to avoid chirp and osc pulling. The T1154 was very unstable with a bad chirp, surprised it ever passed Quality
That is not the final schematic, this is one I drew as a starting point and there have been many changes (including a cathode resistor to provide some of the bias and a resistor with a few turns on i
Ok D I ran a AM screen modulated 807 long ago , with a resistive divider for the screen voltage , mod transformer [ output transformer , with speaker winding as the input from small amp] to tune open
Probably a early form of Spread Spectrum , hard to JAM if is its jumping about the band and difficult to make a fake transmission if the Tx has a wobbly bob signature : ) G.. From: M0FMT Sent: Wednes
