[Boatanchors] 1930's era cw transmitter

[Bry Carling]

The best bet would be something like a  TZ20, TZ40, 211, 814 or 809 and drive it with a 
smaller oscillator stage, like a 6AG7 or some other low power tetrode - pentode. Maybe a 
6AG7 isn't old enough.


On 1 Jun 2013 at 15:27, David Stinson wrote:
 
> ----- Original Message ----- 
> From: "w5sum" <w5sum at comcast.net>
> 
> >.....  I want to build up a 1930's era CW transmitter.  This could
> be a 
> >cool thread.
> >
> > How many of you have built one and what did you use?..
> 
> For my HRO Sr., I wanted a very simple mid-1930s TX that a kid
> with limited funds might have built on a wooden plank.
> I built a single-tube, crystal-controlled power oscillator using an
> 814.
> Only ran 550 V on the plate for 35 watts out and it is tough on
> crystals.
> FT-243 won't work- too much current.
> So I intend to rebuild it as MOPA (probably still crystal,
> though).
> I cathode-modulated it by plugging the output tranny secondary
> across the key jack.  Worked very well.
> 
> 73 Dave S.
> 
> 
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
> 
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
> 
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list:
> http://www.qsl.net/donate.html
> 
> 
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2013.0.3343 / Virus Database: 3184/6374 - Release Date:
> 06/01/13
>