Hi everyone, I am new to kicad, coming from LTSpice not having much experience getting things working as the interface seems a bit more difficult, anyway, I am just trying to get my tube amp design to a pcb for my box, and I am having the following errors; please see my schematic and the ERC checks below:
The rest of the erc errors say essentially the same things, I figure if I get help solving one or two, then the rest would be easy, thanks in advance!
You need to place all the units of the valve symbol. The EC92 symbol has an A unit which is the triode and a B unit which is the heater. You need to place them and connect them to the heater power supply (usually a separate winding on the power transformer). Without heater power your valves will not glow. Have a look at the EC92 symbol in the editor and choose the B unit from the dropdown to look at it.
This is the section of the documentation about placing symbols and units:
Electronics with incandescent bulbs?
If you’re into nostalgia, then read the bookwork “Tubes and transistors, a comparative study” This bookwork (over 60 pages) was made in 1960 by “The Electron Tube Information Council”, and it claims to: “The editors have attempted to provide a thorough comparison of the two devices as a guide to rational evaluation”. However, the real reason for that book was they knew they were fighting a loosing battle, and by sowing as much confusion as possible, they hoped to keep their own branch of factories running for a few more years. It’s an excellent example of market manipulation from an industry that knew it was dying.
I’d like to post the whole PDF, but it’s 14MB and a bit much for this forum. Hackaday wrote an article about this bookwork:
I found a website with the document. The link above no longer links properly.
I downloaded a copy, just in case this one disappears or is moved as well.
Yes, that is the same link as in the Hackaday article I linked to 
When I clicked on the link in the Hackaday article, it didn’t work. I got a 404 error. I did find it on that same website but the URL is different. Maybe the Hackaday article needs to update to the new URL.
I plan to read it later since I was around when vacuum tubes were still around. Kinda shows my age a bit there. 
That’s marvellous. I recently designed a ESP32-S3 based nixie clock with IN-16. It goes by YANC (Yet Another Nixie Clock 
). Nixie tubes are rare and expensive nowadays at up to €16 a piece.
BTW, seems we are in the same age bracket.
I have a valve (bottle, tube). It makes a nice ornament/paper weight/talking point on my desk as I’ve never built a project for its use. Every now and then I polish the silver plating on the terminals because they tarnish.
It’s the output stage of a 20kW MW radio transmitter.
I don’t think transistors are yet able to duplicate this purpose. 
I was always amazed by how vacuum tubes even worked. You think about it, nothing really touches anything. The electrons travel through the air. Then you look at a old CRT tube. It is literally as fast as the speed of light. It comes out as a beam and then gets bent by the yoke to paint the picture on the screen.
I’ve designed a few transistor type circuits but never a vacuum tube circuit. Sometimes I wish I could set up a board to play with a couple. When I took electronics, we mostly concentrated on transistors and such since tubes were on the way out. That would be the mid 80’s.
If someone has some vacuum tube projects they would like to share, I’d love to get some sent by private message. I been looking at the posts above too. You don’t see many of them nowadays.
