DIY Audio Projects Forum

50 watt tube linear
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Author:  joeberesf [ 07 May 2018, 09:47 ]
Post subject:  Re: 50 watt tube linear

Hi there,

here the site of a Dutch pirate with many transmitter kits and circuits. Looking for the table" ZENDERS & MODULATORS"

For CW with little effort the Ameco AC1 from the 50s. 40m 80m


Author:  hujingdi [ 22 Feb 2019, 01:16 ]
Post subject:  Re: 50 watt tube linear

Is the launcher made by oneself?

Author:  Desert Mann [ 11 Jan 2020, 17:45 ]
Post subject:  Re: 50 watt tube linear

I know I am coming in late on this discussion but, I have some thoughts. Looking at your transmitter, I am assuming a MOPA transmitter that is screen modulated. 6AG7 oscillator with a 6L6GC PA and a 6SN7GT mic pre and screen modulator. Screen modulation is normally kind of thin sounding and 65% is about the best you can do undistorted. So I was thinking you could add another tube a choke and misc other parts and have Heising modulation which will allow the rig 100% modulation plus, you could also add controlled carrier which would turn the carrier down during no modulation. I have been a HAM for the better part of 55 years and this is some of the tricks that HAMs did in the 50s and 60s to get more punch out of their mobile rigs, I got in at the end of the A,M, dynasty when there was nothing on 2 meters but A.M. and that was sparse. Another suggestion would be whatever amplifier you decide on, make it grounded grid. THey are some much easier to build and you have virtually no neutralization problems. The 6146 in particular can be a hand full even in the best design. When you are going to use a linear to boost an A.M. transmitter it is best to have one that is capable of 3 time what you want as the final output. A.M. is very high duty cycle so, you want plenty of headroom. If you are interested, let me know and I will put together some information for you. Oh yes there is one more thing... You can have a clean signal with over 100% modulation but, you have to limit the negative peaks because it is the negative peaks that cause to output to go past cutoff which makes them go non-linear...
Best Regards,

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