31-01-2021, 10:29 AM
My favourite prototyping medium is perforated board without any copper at all. 0.1" grid and double ended "vero" pins. I run a heavy 0V busbar round the edge and work from there. Tidy it is not, but it gets the job done. Much better than verobaord with copper strips in my opinion. A roll of thin insulated wire, as used for wire wrapping and a roll of thin (26swg or so) tinned copper wire are essential accessories.
Sometimes I've used similar boards with a "colander" ground plane. This gives excellent high frequency results.
I haven't done any valve based prototyping but I'd be tempted by single sided copper clad fibreglass. Possibly even double sided. It would have the grounding performance of a proper chassis. An 0V connections are easy to solder down. Also easy to punch and drill holes. An inexpensive set of stepped drills would be veryuseful here, as in many other jobs: https://www.amazon.co.uk/Stepped-Drill-B...+Drill+Bit
Sometimes I've used similar boards with a "colander" ground plane. This gives excellent high frequency results.
I haven't done any valve based prototyping but I'd be tempted by single sided copper clad fibreglass. Possibly even double sided. It would have the grounding performance of a proper chassis. An 0V connections are easy to solder down. Also easy to punch and drill holes. An inexpensive set of stepped drills would be veryuseful here, as in many other jobs: https://www.amazon.co.uk/Stepped-Drill-B...+Drill+Bit
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
