[ARC5] BC453 on 24V

[J Mcvey]

 I was able to replace that strange tube with a pair of IRF640 mosfets and three resistors.I think it works better than the original tube and a whole lot less heat and current draw.

    On Wednesday, December 11, 2019, 12:46:47 PM EST, Ian Wilson <ianmwilson73 at gmail.com> wrote:  
 
 Some of those receivers used the 28D7 dual beam power tube. This is quotedas 175mW audio output in push-pull with 28V supply. That reminds me, I havesome of these "somewhere"...
73, ian K3IMW
On Tue, Dec 10, 2019 at 4:24 PM Robert Eleazer <releazer at earthlink.net> wrote:

I used to power up the filaments on my R-11A and reduce the B+ until it quit.  I found I could get down to just a little before I got to 28VDC and still be able to hear a signal.  And with the basic R-11A there was no volume control or gain control.  You just plugged in a headset and listened. Note that the various BC-1206 receivers all work on 28VDC B+ and filament voltage, as does the R-392, and numerous tube type marker beacon receivers, including the BC-357, BC-1033, and R-666. WAyneWB5WSV     ______________________________________________________________
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