The Pine Board Project begins building the 80 and 40 meter AM tube transmitter on Ham Nation this week. Join the hundreds who are following the hundreds who are building this two band transmitter built on Pine Board. Put Ham Nation in Google and follow the show on Leo Laporte's TWIT network each Wednesday at 8 Pm, CDT. All of the video clips and diagrams are also at www.heilsound.com. Warm up those soldering irons and join in the fun.
Hi, I love this, I am a builder myself. Love to see the schematic. I recently rebuilded the Marconi R1155, was great fun. Check it out on my website PD3WMZ. Tell what you think. 73 and God Bless Jo
That's pretty nostalgic, and reminds me of my first transmitter that was on a piece of plywood it had a 6L6 tube.
Just finished my power supply this week, I am looking forward to seeing the transmitter parts list and schematics when they are posted
Was just wondering "hope you dont get mad" why such HIGH voltage for a starter project? I know some people who are very interested in this project but, the high voltage aspects of Tube technology scares the hell out of them. I pointed them to some alternative projects with transistors but, they still wish they could follow along with the show and your project.
The 120VAC mains supply is more lethal than the B+. How on Earth did so many new hams survive the tube era? </sarcasm> 73, Jeff WN1MB Winsted CT http://alienjeff.net
Thanks, Jeff. thanks for following the Pine Board Project. We constantly talk about the high voltage and it is something that every builder - SS or vacuum tubes shoudl respect and know about. We are able to teach the entry levels much more about circutry with vacuum tubes. Stay in touch, Jeff BOB
How right you are, Jeff. It is something that is a big part of the Pine Board Project - teaching some respect of circuitry and with building on Pine Board, one can actually SEE and trace the circuit from the great drawings Gene W4IQN is doing. Thanks for being with us. Stay in touch.
Your power supply looks great! Keep up the good work. Just respect the high voltage and I see you have a cover on the HV terminals. Good one ! Tomorrwo night is transmitter night.... see you on the other side of the screen.
The students only "get the heck" scared of them if we fail to teach them about the HV circuits. Solve that by teaching the circuits and where NOT to stick your fingers ! Thanks for teaching..
thanks Bob, this has been a great learning experience for me. I recently fixed up a old U-Test-M tester (see photo) like the one that my dad wb6hny used to work on when my grandfather owned a business in So Cal called Ettco Distribution that places, maintained and stocked these testers in the southwest. So this gives me a excuse to use the tester...also I am looking to restore some of old USSAF radio sets (see photo for the collection) so all this is helping understand how they all come together!
Finished the power supply and working on the preamp. Tomorrow going to get the rest of the parts. Can't wait to build the transmitter!!! Can I mod it to make it a 10m transmitter?
Been working with high voltage since my very first BC-312 receiver. I was 12. Had my first high voltage mistake whilst holding on to the ground clip of the second anode probe on an RCA color set. That was exciting, and at 60 years old - something I will never forget. Remember, "Other hand in the pocket" working with any live power. Period. Teach personal responsibility again in the schools so that fear won't be the ruler. Bob, you're right! Teach where not to touch, AND WHY!
Based on the PS schematic I saw on Ham Nation, and since this is meant as a learning experience, I have two suggestions. Move the power switch from the neutral side of the transformer primary to the line side by the fuse. The neutral should not be switched. Add a 3-wire power cord and ground the frame of the transformer. The danger is that the transformer could fail with an internal short. With the neutral open at the switch, and with no equipment grounding conductor, you could become the return path. 73 Rich W9YAC