What schematic software do you use?

[500VDC]

I have a few old amps that do not have schematics, nor could I find anything out on the web, so I want to spec the circuits out and make my own, while they still function so I can measure good values.

I have seen some schematics on the web that guys have done that look fairly progessional. They have resistor, capacitor, tube symbols. Simple, but look good.

I googled schematic software and was inundated with choices. So... anyone in here have any recommendations? Free is good, but I don't mind paying a bit either. Obviously I don't want to pay hundreds for AutoCAD or something like that - it's personal use and so needs to be inexpensive.

[Old Tele man]

...believe it or not, but you can do some interesting "stuff" simply using the graphics in MS Excel, using the spreadsheet cells as the "grid."

[bluesaxe]

One software package that I've used pretty effectively is Switcher CAD from Linear Technologies. It's free! You can get it here ->

http://www.linear.com/company/software.jsp

Duncan Munro has a lot of SPICE Tube Models that you can use to run actual simulations with Switcher CAD.

http://www.duncanamps.com/spice.html

Tube CAD is another option if you want to spend a few buck (it's like $40).

Have fun!