Archive for December, 2015

6V6 Vintage Kit as QRP Transmitter

December 22, 2015

Today we tested our “Remember When” Transmitter with 135 volts on the plate.  This was done at the request of an amateur who had recently built a power supply with 135 volts out at 50ma.  He was wondering what kind of power output could he expect from our Pastime Projects kit at this voltage.

Rather that interpret tube characteristics,  I went to the shop and set up the test.  There are some photos attached. I found that we could expect about one watt output into a 50 ohm load with 135 volts on the plate. This is definitely QRP (low power) operation!

He had experience with QRP operation, so the result was not unexpected. Our power supply kit runs about 200 volts dc and provides about 2 watts out. We recommend no more that 300 volts on our 6v6 kits.  The 6v6 will provide 10 to 14 watts output in certain classes of operation and higher levels of plate voltage.

Hope the pictures show the story.  We used a new imported 6V6 such as we sell on http://www.pastimeprojects.com. We used a new International Crystal made to old specifications (we also stock a few). Questions ?  contact me at pastimeprojects (at) yahoo (dot) com.  73  Glenn

SAMSUNG CAMERA PICTURES

SAMSUNG CAMERA PICTURES

SAMSUNG CAMERA PICTURES

SAMSUNG CAMERA PICTURES