"Ian Thompson-Bell" <ruffrecords@[EMAIL PROTECTED]
> wrote in message
news:fukk52$pbo$1@[EMAIL PROTECTED]
> Iain Churches wrote:
>> Hi Ian. I use Sprint layout. There is a free trial version also
>> http://www.abacom-online.de/uk/html/sprint-layout.html
>>
>
> Does this include footprints for tube bases??
>
There is an extensive macro library of resistors, caps, transistors,
regulators, etc. But no tube bases. I am told one can write your
own, but I have never needed to do this.
I never put the tube base on the board anyway. I use a
construction method that I have seen in British mil spec
equipment with a metal sub-plate to which the tube-bases are
fixed, below the amp top panel. The PCB is fixed below the
plate with 3mm machine screws and standoffs. . There is a
hole in the PCB about the size of the tube base, and short
wires are soldered to the base tags, and taken out to pads
or turrets on the PCB.
The military used red for anode, blue for cathode and green for grid.
I do the same.
http://www.kolumbus.fi/iain.churches/Pics/105Board05.jpg
Cheers
Iain
|
