The Pine Board Project continues building the 80 and 40 meter AM tube transmitter on Ham Nation this week. Join the hundreds who are building this two band transmitter, equalized microphone Pre Amp and Power Supply built on Pine Board. Find Ham Nation i n 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.
If you use DC on the filament you can get rid of the hum. With modern rectifiers and caps the rig can actually sound quite clean.
Thanks for your note. yes, true it is, but trying to keep this first project simple and operational. Truthfully, I have been using this very transmitter on our morning AM gatherings and there is not a trace of any 60Hz hum. The layout and ground path helps very much here. Please stay in touch. BOB
While I really like the world of FETs and ICs, the truth is that valve circuits are beautiful things.
Hi Matt Thanks for your post. My focus for the Pine Board Project is to get more building building and understanding exactly how the circuits work. Vacuum tubes are the best way to do that. Many of us started designing and building our equipment back in the 40'50's and 60's and learned so much. This is what we are trying to bring to the fraternity and I am so very happy that so many have joined in. From there, one can relate the technology to solid state technology. I can tell you it is much more of a thrill to build and OPERATE tube transmitters that you built. Fun stuff. Stay in touch, Matt. BOB HEIL, K9EID
Can't beat valves to play around with, much more forgiving than transistors and ic's Hope you get a great following . 73s ZL1API
My first home brew transmitter in the 60's used a 6146 and was crystal controlled. It wasn't on a pine board but on a bud box. Contacts were more fun back then!
WA5PQL I certainly agree. The fun of building the transmitter but the real fun of making contacts with your creation is somethign you just have to experience. Plans are to build a 6146 'amplifier' for this 6AG7 rig - or any other QRP rig..... and much more fun with tubes than solid state devices. thanks for being with us BOB HEIL, K9EID
Wow, what a flood of memories this brings back. My first ever transmitter was built on a scrap 2 X 10 I found in my Dad's work shop, a bunch of parts scrounged from an AM radio I pulled from my neighbors trash and some odds and ends from Radio Shack I think. That was a LONG time ago I was like 10 or 11.... like I said ... a LONG time ago!
Bob, I couldn't find the 4H, 50ma DC choke filter on Antique Radio's site...do you have any other sources where I might be able to find this part? I am almost done with my Mic Preamp and excited to start the transmitter
maybe one of these would do: https://www.tubesandmore.com/products/transformers_chokes?filters=Type=Choke
Those were glorius time sin Amateur Radio and I am trying to share some of those days with the new hams of today. We rode our bikes around town looking for old TV sets on the curb. What a treasure trove of parts, eh? Glad to have you joining us. Godo stuff tonight.... don't miss. BOB K9EID The choke is available AES part # P-CF 22707 Will be showing th entire parts list tonight. Stay in touch... BOB, K9EID
