Ian Thompson-Bell wrote:
> Iain Churches wrote:
> > "Ian Thompson-Bell" <ruffrecords@[EMAIL PROTECTED]
> wrote in message
> >> 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
>
>
> Excellent idea, and the metal plate acts as a screen too. Neat.
It's a nice system albeit shockingly time consuming to assemble.
Graham
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