"Eeyore" <rabbitsfriendsandrelations@[EMAIL PROTECTED]
> wrote in message
news:480E2A44.8658D7DE@[EMAIL PROTECTED]
>
>
> 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.
You should see the row of housewives in their floral aprons and
headscarves, Graham. They can assemble and wire a batch of
these boards before you can say "Karaoke" :-)
Iain
|
