• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Recommended PCB software

I thought I'd try KiCad first as its free and is well regarded. So this is a headphone amp for 32R headphones. HT = 100V and uses some cheap Multicomp 120-0-120, 0-12, 0-12 1VA6 mains toroid's as OPT's. No problems so far with the schematic - has parts for ECC83 and ECC88.
 

Attachments

To save you the headache of downloading and opening a pdf, here's the attachment of post 44

Click on the image to see it full size and undistorted

attachment.php




_
 

Attachments

  • fnorgarnableurummf.png
    fnorgarnableurummf.png
    59 KB · Views: 508
I’ve been using Kicad for 3 or 4 years and have made a lot of boards ranging from small positive and negative Maida regulators to very large 4 way valve crossovers complete with filter cards on daughter boards with edge connectors.

The thing l like a about Kicad, apart from being free of course, is the amazing variety of video tutorials. Anything you want to know how to do, or any question you have, someone else has already asked it.

I started with v4 and made my own footprints for 7, 8 and 9 pin tube sockets, and lots of higher wattage resistors. V5 has a much larger library and millions of symbols, footprints and 3D models are available from places like Mouser and Digikey.

So, I can recommend it. That said, I haven’t used anything else ….apart from being involved in the development of automated layout software back in the days when computer programs were on punched cards. You didn’t want to drop an 18” long box of cards!
 
I look at PCB layout like others look at jigsaw puzzles or video games.

I'm working my way through my first non trivial layout (in kicad 5.99) and it's been a steep, fairly painful learning curve, but the layout and routing was great fun, a really neat puzzle game trying to make something that looks nice and was electrically sound.
 
Valve socket footprints

Could I ask a favor. I am getting on OK with KiCad. Could anybody who has valve footprints - I would love them.

Hi. Here are my 7, 8 and 9 pin socket footprints.

No 3D models though. If I ever have time that's something I should look into.

Always puzzled me why Kicad has valve footprints but nobody would ever solder a valve directly to a board.
 

Attachments